Construction Photo Album

Welcome! Construction is now complete on the Hoover Dam Bypass Project: both the Arizona and the Nevada Approaches are finished and construction on the Colorado River Bridge was completed in October! Scroll down the page (or use the Quick Jump menu) to see our construction photos.

Click on any thumbnail to view an enlarged version of that photo. Please note that you will need to use the Back button on your browser to return to this page. If you prefer a higher resolution image (300 dpi or more), you can also download these from our site using the High Resolution link located below each thumbnail. Please note that these higher resolution images (which are provided in TIF format) will take longer to download.

Quick Jump:


2010 Photos
Interpretive Plaques August 2010 April 2010
Dedication Activities Bridge Construction
(time lapse video)
March 2010
October 2010 June/July 2010 February 2010
September 2010 May 2010 January 2010

2009 Photos
December 2009 April 2009
November 2009 August 2009 March 2009
October 2009 June 2009 February 2009
September 2009 May 2009 January 2009

2008 Photos
December 2008
November 2008 June 2008 Interim Surfacing March ’08
October 2008 Interim Surfacing May ’08 March 2008
September 2008 May 2008 Interim Surfacing Feb ’08
August 2008 Interim Surfacing April ’08 February 2008
July 2008 April 2008 January 2008

2007 Photos
December 2007 July 2007
November 2007 June 2007 March 2007
September/October 2007 May 2007 February 2007
August 2007 April 2007 January 2007

2006 Photos
August 2006 April 2006
November/December 2006 July 2006 March 2006
October 2006 June 2006 February 2006
September 2006 May 2006 January 2006

2005 Photos
December 2005 August 2005 April 2005
November 2005 July 2005 March 2005
October 2005 June 2005 February 2005
September 2005 May 2005 January 2005

Additional Images/Photos (Including Arizona Approach.)

Interpretive Plaques

Dedication Plaque Final

Hoover RB Balustrade Plaque Final

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Panel 1.9

Panel 2.1

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Panel 2.4

Panel 2.5

Panel 3.1

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Panel 4.1

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Panel 4.5

Panel 5.1

Panel 5.3

RB Sidewlk Monuments

Dedication Activities


Arizona Governor Jan Brewer addressed the attendees at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Nevada Congresswoman Dina Titus gave her remarks at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Nevada Senator Harry Reid spoke at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Federal Highway Administration Administrator Victor Mendez welcomes guests to the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge (seated left to right: NV Congresswoman Dina Titus, NV Senator Harry Reid, and Secretary of Transportation Ray LaHood).
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Secretary of Transportation Ray LaHood spoke to the guests at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Nevada Senator Harry Reid gave his remarks at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge (seated left to right: FHWA Administrator Victor Mendez, NV Lt. Governor Brian Krolicki, and AZ Governor Jan Brewer).
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Distraction, an all-girl group from Kingman, AZ sang the National Anthem at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Nellis Air Force Base Honor Guard performed the presentation of colors at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Leroy Spotted Eagle, Spiritual Leader of the Southern Paiute people performed the blessing on the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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The Red Hand Dancers performed an intertribal dance, blessing the new Mike O’Callaghan-Pat Tillman Memorial Bridge and project area.
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The families of Mike O’Callaghan and Pat Tillman were honored at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Hoover Dam Bypass Project Manager Dave Zanetell presented the families of Mike O’Callaghan and Pat Tillman with commemorative plaques that included scaled-down versions of the memorial pieces mounted on the new Bridge.
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Attendees of the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge arrived via Regional Transportation Commission of Southern Nevada double-decker buses.
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Guests of Bridging America enjoying the memorial wall in the pedestrian plaza, just north of the new Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Families walking the entire length of the new Mike O’Callaghan-Pat Tillman Memorial Bridge at Bridging America.
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Visitors enjoyed reading about the project on large panels in the pedestrian plaza just north of the new Mike O’Callaghan-Pat Tillman Memorial Bridge.
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The grand view of Bridging America on the new Mike O’Callaghan-Pat Tillman Memorial Bridge.
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A majestic view of the public celebration event Bridging America.
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The U.S., Arizona and Nevada flags unfurl on a clear day at Bridging America.
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At Bridging America, guests enjoyed the pedestrian walkway on the new Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Commemorative, metallic blue bottled water kept the crowd well hydrated at Bridging America.
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Souvenirs of this shot of the new Mike O’Callaghan-Pat Tillman Memorial Bridge and the Hoover Dam as the backdrop were given to all attendees at Bridging America.
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The Hualapai Tribe’s White Water Group performed a special song and Bird Dance at the Dedication of the Mike O’Callaghan-Pat Tillman Memorial Bridge.
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Video

Watch a time lapse video of the bridge being constructed

Colorado River Bridge Construction (27 MB)

Images from October 2010

Colorado River Bridge


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Images from September 2010

Colorado River Bridge


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Images from August 2010

Colorado River Bridge



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Images from June & July 2010

Colorado River Bridge



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Images from May 2010

Colorado River Bridge



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Images from April 2010

Colorado River Bridge



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Images from March 2010

Colorado River Bridge


looking southeast

View of the bridge as seen from Nevada towards Arizona.

In the background, the Arizona approach roadway is visible.

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looking south

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) and the new US93 alignment as seen from above Hoover Dam.

The Arch is complete with all spandrel piers constructed. Steel girders remain to be placed for spans 6 and 7 and portion of span 14. Stay-in-place steel decking is erected between the girders at spans 10 and 11. Climbing scaffolding is attached to pier 6-RT column.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge).

Left side of the picture – Steel girders are staged on the approach deck, waiting to be set between the Arch spandrel piers. Stay-in-place steel decking is erected between the girders at spans 10 and 11.

Right side of the picture – A mobile crane is set on the deck, servicing workers below at the AZ skewback footing.

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looking north

View of the bridge as seen from Nevada towards Arizona.

Steel girders are staged on the Nevada approach deck, waiting to be set between the Arch spandrel piers. Stay-in-place steel decking is erected between the girders at spans 10 and 11.

In the background, the Arizona approach roadway is visible.

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Images from February 2010

Colorado River Bridge



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Images from January 2010

Colorado River Bridge


looking east

A truck transports a 115′ long steel girder onto the NV approach and waits for off loading. Attached to the top flanges of the girder, above the end plate, are temporary support brackets the will suspend the girder in-place from the top of the pier cap until PT bars are installed through the holes in the end plate and attach the girder to the pier cap face.

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looking west

In the Obayashi / PSM, JV precast yard located near Boulder City, workers utilize a rubber tire gantry crane to hoist a 115′ long steel girder onto a truck for transport to the bridge site.

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looking east

The North highline hoists and transports a steel girder out onto the Arch for placement between Pier 10 and 11 spandrel column pier caps. On the NV approach deck, several girders are stage for sequenced placement. The South highline is in use, delivering materials to waiting crews on the Arch. To the bottom left of the picture, the orange stripping platform is cantilevered over the completed right barrier railing to allow worker access to the underside of the deck. Across the canyon, a Grove RT635C Crane sets on the AZ approach deck, above Pier 14, servicing crews working below on the AZ skewback.

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looking northeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 3, 4, and 5 are visible. On the Arch, all spandrel piers are completed with climbing scaffolding attached to piers 6-LTRT and 13-LT columns. Pier 13-RT column has system scaffolding encasing it for worker access.

The north highline crane transports a steel girder out for erection between Pier 10 and 11 spandrel column pier caps. The South highline is returning after delivering crews to work areas on the Arch.

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looking north

Parked partially on the bridge deck at span 1, Olsen Beal crews attach highline crane rigging and prepare a steel girder for off loading. Safety lines have been installed to the tops of the web flanges. Temporary support brackets will be attached to web flanges above the end plates prior to setting this girder into its final position between two spandrel column pier caps.

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looking southeast

As seen from the existing US93 Hairpin in Nevada, the completed Arch spans across the Colorado River.

From right to left side of the picture – Spandrel Pier 6 is visible with climbing scaffolding attached to the left & right columns. Piers 7 through 13 are completed with pier caps in place. Steel girders spanning between pier 9 and 10 (span 10) and between 10 and 11 (span11) are erected with access scaffolding visible, suspended from the pier caps.

Spanning the canyon above the bridge are the twin cables of the highline crane systems.

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Images from December 2009

Colorado River Bridge


looking south

View of two of four steel girders, set in place, spanning between piers 9 and 10. Suspended from the top of the piers caps, are temporary platforms to allow worker access for steel girder placement.

Utilizing the cantilevered man basket, suspended from the south highline, Obayashi / PSM, JV crews access the underside of the right Arch rib below pier 10 to perform finishing work of the Arch soffit.

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looking north

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 3, 4, and 5 are visible. On the Arch, Spandrel Piers 6 through 13 are completed with their caps spanning between the left and right columns. Two of four steel girders span between piers 9 and 10. Utilizing the cantilevered man basket, suspended from the south highline, Obayashi / PSM, JV crews access the underside of the right Arch rib to perform finishing work.

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looking southeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from existing US93 hairpin in Nevada.

Left to Right side of the picture The completed Arizona approach with the deck constructed to Pier 14. Climbing scaffolding is attached to Pier 13-LT. Obayashi / PSM, JV crews remove system scaffolding from Pier 13-RT. Completed pier caps are visible for piers 13, 12, 11, 10, and 9 with temporary access platforms attached. Moveable access platforms ride the top of the Arch between piers 11 and 12 for finishing operations. Below the right arch rib, a cantilevered man basket is suspended from the south highline to allow finishing operations of the Arch soffit.

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looking northwest

On the Nevada approach deck, steel girders are staged with steel safety lines attached along the top of the upper flange. These girders, weighing upwards of 50 tons will be transported by the highline crane and placed to span between the spandrel pier caps, on top of which, the concrete roadway deck will be constructed.

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looking south

On the Nevada approach deck, Obayashi / PSM, JV crews place concrete to construct the southbound right side barrier railing.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the pictureThe completed Nevada approach with the deck constructed to Pier 5. Obayashi / PSM, JV crews continue constructing the southbound right side barrier railing. Steel girders are staged on the deck, awaiting placement between spandrel piers.

Right side of the picture all spandrel piers and pier caps are completed. Scaffolding encases piers 6, 7, and 13. Temporary platforms are suspended from the tops of the piers caps to allow worker access for steel girder placement.

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Images from November 2009

Colorado River Bridge


looking north

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 2, 3, 4, and 5 are visible. On the Arch, Pier 6 is erected to segment 13, Piers 7, 8, 9, 10, 11 and 12 are completed with the falsework for their pier caps spanning between the left and right columns, and Pier 13 is completed with the climbing scaffolding attached at the bottom of the left column.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the deck constructed to Pier 5. Obayashi / PSM, JV crews construct formwork for the southbound right side barrier railing.

Right side of the picture – all spandrel piers are completed with the exception of Pier 6. Falsework and formwork for Piers 7 and 12 spans between their left and right columns. Caps at Piers 8, 9, 10, and 11 are completed and formwork removed.

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looking southeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the deck at Pier 5.

Spandrel Pier 6-right is erected to segment 18, Pier 6-left to segment 16. Utilizing the highline, Olsen Beal crews are transported off of Pier 6-left in a man basket. Pier 6-right is completed with its 18th segment set. Further out on the Arch, Pier 7 is completed with the falsework and formwork for the pier cap in place. Spanning between the left and right ribs of the Arch at each pier, precast concrete panels encase the steel strut members.

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looking southwest

As seen from the existing US93 Hairpin in Nevada, the completed Arch spans across the Colorado River.

From right to left side of the picture – Spandrel Pier 6-right is erected to segment 18, Pier 6-left to segment 16. Pier 7 is completed with the falsework and formwork for the pier cap in place. Caps at Piers 8, 9, 10 and 11 are completed with their formwork stripped. Falsework and formwork for Pier 12’s cap is set.

Spanning the canyon above the bridge are the twin cables of the highline crane system.

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looking northwest

On the Nevada approach, Obayashi / PSM, JV crews set formwork for the southbound right side barrier railing. A Quality Control field engineer inspects the operation.

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looking west

Underside view of the bridge as seen from the existing US93 at the Nevada Hairpin. Utilizing an under slung mobile scaffolding, Obayashi / PSM, JV crews remove deck overhang brackets from spans 1 and 2. High above the deck, the highline cranes transport materials out to the Arch.

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looking south

The Arizona Approach as viewed from the Hoover Dam parking lot in Arizona.

From left to right side of the picture – the completed deck and Pier 14. Pier 13 is completed, awaiting placement of pier cap falsework. Piers 12 and 11 are completed with formwork and falsework in place for the caps. Scaffolding encases the columns of Piers 11, 12, and 13-left for worker access. At the far right, the cap of Pier 10 is visible above the Arch. A temporary access bridge spans between the skewback footing of Pier 14 and the Arch at Pier 13.

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Images from October 2009

Colorado River Bridge


looking southwest

On the Arizona approach, Olsen Beal crews remove the temporary pylons from above Pier 14 using a Liebherr LTM1400-7.1 crane.

Right Center of the picture – Utilizing the highline crane, Olsen Beal crews erect segment 5 of Pier 11-left.

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looking north

On the Nevada approach, Obayashi / PSM, JV crews assemble pier cap falsework and formwork.

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looking south

On the Nevada approach, a delivered precast spandrel column segment waits to be transported out onto the Arch by the highline crane system. Crews attach temporary platforms to the sides of the segments for worker access. Steel post tensioning rods are pre-loaded into the vertical ducts in the segment walls along with a survey prism, attached to the upper portion of this segment prior to transportation.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1.

Left side of the picture – The completed Nevada approach, with piers 4 and 5 visible.

Center to Right side of the picture – Pier 7 is erected to segment 3. Piers 8, 9, 10, and 11 are complete and have cap falsework in place. Between the two Arch ribs, the steel struts are encased in pre-cast concrete panels.

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looking northeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 3, 4, and 5 are visible. On the Arch, spandrel columns are completed at Piers 8, 9, 10, and 11 with the falsework for their pier caps spanning between the left and right columns. Pier 7 is erected to segment 4, Pier 12-left to segment 7 and Pier 12-right to segment 10.

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looking south

Left side of the picture – Utilizing the highline crane, Olsen Beal crews erect segment 2 of Pier 13-right. Pier 13-left has segment 1 erected on top of the plinth. To the left of Pier 13, an access bridge spans between the Arch and Pier 14

Right side of the picture – Pier 12-right is erected to segment 9 while Pier12-left to segment 7.

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looking southwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

Left side of the picture – The pier cap falsework is erected on top of Piers 8, 9, and 10. Olsen Beal crews continue erecting precast concrete spandrel pier column segments at Pier 7.

Right Center of the picture – the completed Nevada approach is visible.

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looking west

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from above the left side of abutment 2, facing Nevada.

Left side of the picture – The completed Arizona approach and Pier 14.

Center to Right side of the picture – The completed Arch with spandrel columns in various stages of completion. Pier 13-left has segment 1 erected, Pier 12-right is erected to segment 10, Pier 12-left to segment 7, Pier 11 is complete with the cap falsework spanning between the columns. Behind Pier 11, completed Piers 10, 9, and 8 are visible. The steel struts between the two Arch ribs are encased in pre-cast concrete panels.

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looking southeast

As seen from the existing US93 Hairpin in Nevada, the completed Arch spans the Colorado River.

Formwork for Pier 6 plinths are in place. Pier 7 is erected to segment 3; Piers 8, 9, 10, and 11 are complete and have cap falsework in place. Between the two Arch ribs, pre-cast concrete panels encase the steel struts.

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looking northeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1.

Right Center of the picture – The Arch is complete. An Arch strut is erected between the ribs at Pier 6 and precast concrete spandrel pier column segments at erected at Pier 7.

Left Center of the picture – On the Nevada approach, pier cap falsework is being constructed.

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looking west

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from above the left side of abutment 2, facing Nevada.

On the Arch, Olsen Beal crews are erecting precast concrete spandrel pier segments at Piers 7, 8, 9, 10, 11, and 12. Temporary platforms are attached to the sides of the segments for worker access.

On the Nevada approach, pier cap falsework is being constructed. Once finished, they will be transported out and attached to, and span between, the completed pier columns.

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Images from September 2009

Colorado River Bridge


looking southwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from Hoover Dam.

The Arch is completed with a majority of the temporary forestays and backstays removed. The temporary pylons for the cable stays remain standing on top of Pier 5 (Nevada) and 14 (Arizona). Utilizing the highline crane, Obayashi / PSM, JV crews remove work platforms from on top of Arizona pylons.

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looking west

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the left side of abutment 2, facing Nevada.

The Arch is completed with a majority of the temporary stays removed. Obayashi / PSM, JV crews are installing the precast concrete panels around the Arch strut at Pier 11. Formwork is set for construction of the spandrel column plinths at Piers 10, 11, 12, and 13.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1 with a majority of the temporary stays removed. Obayashi / PSM, JV crews are in the process of removing the remaining stays and temporary pylons. On the Arch, work is progressing to construct the plinths for the spandrel columns and installation of the precast concrete panels around the Arch struts.

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looking southeast

Obayashi / PSM, JV crews removing the stay cables from the temporary pylons on the Nevada approach, above Pier 5.

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looking southeast

Obayashi / PSM, JV crews removing the stay cables from the temporary pylons on the Nevada approach, above Pier 5.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1.

Left side of the picture – Olsen Beal crews continue removal of the temporary pylons from above Pier 5 using a Liebherr LTM1400-7.1 crane.

Right Center of the picture – the completed Arch with precast spandrel column segments erected at Piers 8-LTRT, 9-LT, 10-LT, and 11-LTRT. Crews are at Pier 10-RT waiting for the highline to deliver its first segment.

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looking north

Using a crawler crane, Olsen Beal crews unload a precast Spandrel column segment and prepare it for transport to Pier 10 by the highline crane. The segment has work scaffolding attached to the exterior sides and vertical post tensioning bars inserted into the ducts.

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looking east

Left side of the picture – on the Nevada approach, above Pier 5, Olsen Beal crews continue removal of the temporary pylons using a Liebherr LTM1400-7.1 crane.

Center of the picture – the south highline crane carries a precast Spandrel column segment out for erection at Pier 10.

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Images from August 2009



View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from along side of Abutment 2 in Arizona.

The Nevada and Arizona Arch cantilevers are constructed to segment 26 with the closure segment remaining to be constructed. The temporary stay system is complete with all the forestay/backstays installed.

Spanning between the two ribs of the Arch are the Arch struts (grey steel X structures), connecting the ribs together.

At the right side of the picture, the Nevada approach is visible.
Spanning the canyon, above the temporary pylon is the highline crane system.

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Left side of the picture – The Arizona Arch headings are constructed out to segment 26 with all the forestays installed. Spanning between the two ribs is a temporary strut which will be kept in place until the permanent Arch strut is erected at segment 24.

Right side of the picture – The Nevada Arch headings are constructed out to segment 26 with all the forestays installed and the permanent Arch strut erected at segments 19 & 24.

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View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from below. The Arch cantilevers are nearing connection with the closure segment remaining to be constructed.

Left side of the picture – The Nevada Arch cantilevers are constructed out to segment 26. Arch struts are erected between the ribs at segments 19 & 24.

Right side of the picture – The Arizona Arch headings are constructed out to segment 26. An Arch strut is erected between the ribs at segments 19, with a temporary strut at segment 23

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View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from Hoover Dam.

The Nevada and Arizona Arch cantilevers are constructed to segment 26 with the closure segment remaining to be constructed.

The temporary pylons for the cable stays are constructed on top of Pier 5 in Nevada with all the Forestay/backstays installed.

Arch struts (grey steel X structures), connecting the two Arch ribs, are constructed at Nevada segments 7, 13, 19, and 24. On top of the Arch ribs, at these locations, precast column segments for the spandrel piers will be erected.

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View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – The Nevada approach is visible with the Arch headings projecting outward to segment 26 with all Stay systems installed.

Right side of the picture – The Arizona approach is visible with the Arch headings projecting outward to segment 26 with all Stay systems installed.

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Left side of the picture – The Arizona Arch headings are constructed out to segment 26 with all the forestays installed. Spanning between the two ribs is a temporary strut which will be kept in place until the permanent Arch strut is erected at segment 24.

Right side of the picture – The Nevada Arch headings are constructed out to segment 26 with all the forestays installed and the permanent Arch strut erected at segment 24.

Obayashi / PSM, JV crews are currently constructing formwork for the closure segment to complete the connection between the Nevada and Arizona cantilevers.

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View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Both ribs of the Arch are constructed to segment 26 with the form travelers removed. Stay system installation is completed. At the center of the Arch, light can be seen coming from the interior of the Arch ribs, shining through the gap between the Nevada and Arizona cantilevers.

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Images from June 2009

Colorado River Bridge


looking southwest

View of the Arizona approach of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge).

The temporary pylons for the cable stays are constructed on top of Pier 14. The Arch projects outward to segment 22 with forestay cables spanning between the pylons and the Arch. Backstays span between the temporary pylon and the backstay anchor block.

Arch struts (grey steel X structures), connecting the two Arch ribs, are constructed at Arizona segments 7, 13, and 19. On top of the Arch ribs, at these locations, precast column segments for the spandrel piers will be erected.

Forestays 11 are installed into the temporary pylon heads, waiting installation into the Arch ribs at segments 22. Backstays F are fabricated on the Arizona approach and await installation.

High Resolution TIF (14 MB)


looking northeast

View of the Nevada approach of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge).

The temporary pylons for the cable stays are constructed on top of Pier 5. The Arch projects outward to segment 22 with forestay cables spanning between the pylons and the Arch. Backstays span between the temporary pylon and the backstay anchor block.

Arch struts (grey steel X structures), connecting the two Arch ribs, are constructed at Nevada segments 7, 13, and 19. On top of the Arch ribs, at these locations, precast column segments for the spandrel piers will be erected.

High Resolution TIF (14 MB)


looking southwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from above Hoover Dam.

Left side of the picture
– The Arizona approach is visible with the Arch headings projecting outward to segment 23.

Right side of the picture – The Nevada approach is visible with the Arch headings projecting outward to segment 22.

High Resolution TIF (14 MB)


looking northeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – In Nevada, both ribs of the Arch are constructed to segment 22. The form travelers are launched out to segment 23 with forestays installed to segment 20.

Right side of the picture – In Arizona, both ribs of the Arch are constructed to segment 22. The left form traveler is launched out to segment 23 with forestays installed to segment 20.

High Resolution TIF (14 MB)


looking northeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) with Hoover Dam and Lake Mead in the background.

High Resolution TIF (14 MB)


looking south

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge).

Left side of the picture – The Arizona approach alignment along with the Kingman Wash interchange and the Sugar Loaf Mountain Bridge.

Right side of the picture – The construction office complex situated in the future Pedestrian Plaza parking lot. The almost complete pedestrian access ramp zigzags up the mountain side from the office area to the bridge abutment 1.

High Resolution TIF (14 MB)


looking southwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) and the new US93 alignment as seen from above Hoover Dam.

Lower Left to top right of the picture – The current US93 alignment winds from Arizona, across Hoover Dam, and on into Nevada.

High Resolution TIF (14 MB)

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Images from May 2009

Colorado River Bridge


looking southeast

In the foreground, an Obayashi / PSM, JV worker and QC engineer place imbeds and adjust reinforcing steel in preparation for top slab exterior formwork to be set on segment NV22-LT in Nevada.

In the background, the left and right Arch ribs project outward from the AZ skewback footing.

High Resolution TIF (14 MB)


looking southeast

View of the left / right Arch ribs as they project outward from the AZ skewback footing. The outer form of the form traveler on the left rib is launched out to segment 22 and is waiting for the reinforcing steel cage to be set. The form traveler on the right rib is currently at segment 21 and crews are removing the top slab exterior formwork and preparing for the collapsing of the inner core formwork. The south highline crane is being rigged to the formwork preparing for removal.

The forestays are visible, spanning from the temporary pylon above Pier 14 and connecting to the Arch.

High Resolution TIF (14 MB)


looking northeast

Arch segment NV19-LT diaphragm / arch strut post-tensioning blister formwork prior to concrete placement as viewed from inside the Nevada right arch rib. To the left and right, the temporary forestay blister can be seen as constructed alongside the Arch interior wall. Below the blisters are blockouts in the floor slab where the temporary strut will be attached to the underside of the Arch with post tensioning bars.

High Resolution TIF (14 MB)


looking north

Working within the confines of a temporary platform at the Pier 8 Arch strut and outfitted with personal fall protection equipment, Obayashi / PSM, JV personnel set blockouts for the transverse post-tensioning bars that will attach the strut, connecting the left and right arch ribs.

On top of the Arch rib, to the right, a template that holds the vertical post-tensioning bars where the pier 8 right column is to be erected can be seen. Connected to the exterior of the Arch and wrapped in white Burlene, is the concrete supply pipe, spanning between the stationary concrete pump at the NV hairpin and the placing boom. Access to the strut is provided through the round access hatch in the Arch wall.

High Resolution TIF (14 MB)


looking northwest

Looking back station down the exterior of the right arch rib in Nevada at the forestays as they project downward from the temporary pylons erected on top of pier 5. In the foreground, a template holds the vertical post-tensioning bars where the pier 8 south column is to be erected. To the right, Obayashi / PSM, JV personnel, outfitted with personal fall protection equipment, work within the confines of a temporary platform, stripping formwork and preparing for the arch strut placement.

High Resolution TIF (14 MB)


looking north

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – In Nevada, the right rib of the Arch is constructed to segment 21 and the form traveler is launched out to segment 22 on the left rib. Crews are currently installing forestays to segment 22 and backstays to the backstay anchor block on the NV approach.

Right side of the picture – The Arch, constructed to segment 21, from the AZ skewback. A temporary bridge spanning between Pier 14 and the Arch can bee seen. This allows simplified construction worker access to the Arch from the Arizona approach area.

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Images from April 2009

Colorado River Bridge


looking south

View of the Arch as seen from the existing US93 at the Nevada hairpin.

Left side of the pictureThe right and left Arch ribs cantilever from the AZ skewback out to segment 17. A temporary work platform spans between the ribs at segment 13 to allow for installation of the steel strut.

Right side of the pictureThe Arch cantilevers out to segment 19 in NV. The temporary forestay cables support the Arch until Arch completion. Crews are in the process of installing forestays into the Arch behind the form traveler system. A stairway system is attached to the outside of the Arch for access to the form travelers.

High Resolution TIF (14 MB)


looking north

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the pictureThe Arch, constructed to segment 19 from the NV skewback. Crews are in the process of installing forestays into the Arch behind the form traveler system.

Right side of the pictureThe Arch, constructed to segment 17, from the AZ skewback.

At the leading edge of the Arch cantilevers, crews continue to advance the form travelers and construct Arch segments.

High Resolution TIF (14 MB)


looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture The completed Nevada approach with the temporary pylons for the cable stays constructed on top of Pier 5. The Arch projects outward to segment 19 with forestay cables spanning between the pylons and the Arch.

Right side of the picture The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. The Arch projects outward to segment 17 with forestay cables spanning between the pylons and the Arch.

Spanning the canyon overhead are the twin cableway cranes.

High Resolution TIF (14 MB)


looking west

At the south back stay anchor block in Arizona, an Obayashi / PSM, JV crew utilize hydraulic post-tensioning jacks to simultaneously stress a set of back stays. These stays span between the anchor block and the temporary pylon head above Pier 14.

High Resolution TIF (14 MB)


looking southwest

On top of the South temporary pylon above Pier 14 in Arizona, an Obayashi / PSM, JV crew position hydraulic post-tensioning jacks in preparation of stressing of a set of forestays connected to the Arch. These cables span between the temporary pylon head above Pier 14 and the arch.

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Images from March 2009

Colorado River Bridge


looking southwest

Nevada Approach and Arch headings as viewed from the crest of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 16. Six sets of forestay cables span from the Arch ribs to the temporary pylons heads and Six sets of backstays span between the head and the backstay anchor block.

Between the Arch ribs are the steel Strut assemblies, located where spandrel Piers columns 6 and 7 will be erected.

High Resolution TIF (14 MB)


looking southeast

As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the Colorado River. Forestay cables span from the Arch ribs to the temporary pylons above.

The Arch strut, connecting the two Arch ribs, is constructed at segment 7. On top of the Arch ribs, at this location, precast column segments for Pier 6 will be erected.

Attached to the top of the Arch ribs are temporary stairs, work platforms, and cross rib access walkways. Workers climb these stairs daily on their way to the form travelers.

High Resolution TIF (14 MB)


looking east

View of the Nevada left from traveler, as seen from the right traveler.

High Resolution TIF (14 MB)


looking northwest

Looking up from the Nevada Arch rib towards the temporary pylons above. Forestays span between the pylon heads and the Arch ribs, sheathed in white HDPE casing. To the left of the left pylon, a set of scaffolding stairs are attached to allow personnel access to the pylon heads. These 155′ tall pylons will remain in place with the stays attached to support the Arch until the Arch is completed. After completion, all forestays, back stays, and pylons will be removed.

High Resolution TIF (14 MB)


looking north

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture The Arch, constructed to segment 16 from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the temporary pylons and the backstay anchor block.

Right side of the picture The Arch, constructed to segment 15, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 14 and backstays span between the head and the backstay anchor block.

High Resolution TIF (14 MB)


looking north

Aerial view of the Mike O’Callaghan-Pat Tillman Memorial Bridge looking to the north from above the Arizona side of the canyon. The Arch is approximately 55% complete.

Left side of the picture – The Nevada approach is visible with the Arch headings projecting outward from the canyon wall. The Arch is constructed to segment 15. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the temporary pylon and the backstay anchor block.

Right side of the picture – The Arizona approach is visible with the Arch headings projecting outward to segment 14. A set of backstay cables are attached to the pylon heads, waiting tensioning as Arch construction progresses outward.

High Resolution TIF (14 MB)


looking south

Aerial view of the Mike O’Callaghan-Pat Tillman Memorial Bridge looking to the south from above the Arizona side of the canyon.

Left side of the picture

Backstay cables extend from the pylons to the backstay anchor blocks. One set of backstays are attached to the pylon head, waiting tensioning as Arch construction progresses outward. A set of scaffolding stairs are attached to the South pylon to allow personnel access to the pylon heads.

Right side of the picture – The Arizona approach is visible with the left and right Arch ribs constructed to segment 15. The form travelers are at segment 16 with the reinforcing cages installed. Five sets of forestay cables extend from the temporary pylons above Pier 14 and attach to the Arch ribs.

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Images from February 2009

Colorado River Bridge


looking south

View of the Obayashi / PSM, JV on-site concrete batch plant. From this plant, all concrete for the project is currently being produced.

High Resolution TIF (14 MB)


looking southeast

View of the Arch from the existing US93 Nevada at the hairpin. A concrete truck delivers another load of concrete to the awaiting pump in Arizona

Foreground – From Nevada, the Arch, projects outward from Pier 5 skewback footing. The vertical post tensioning bars extend upwards from the Arch rib where Pier 6 will be erected, on each side of the steel Arch strut that connects the two ribs. The form travelers are at segment 13.

Background The Arizona approach and Arch ribs are visible across the canyon.

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looking south

Obayashi / PSM, JV crews unload concrete into the re-mixer and concrete pump located on the Arizona skewback footing at Pier 14. Concrete is delivered to the pump by the cableway crane system via an 8cy concrete bucket. From the pump, concrete is conveyed to the placing boom where it is directed into the formwork of the Arch segment under construction.

High Resolution TIF (14 MB)


looking southeast

Inside the form traveler system at Arch Segment NV13-LT, Obayashi / PSM, JV crews placed concrete into the bottom slab formwork. The slick line from the end of the placing boom is directing the flow of concrete through an open pour window in the formwork. Other crew members consolidate the placed concrete while carpenters follow behind and close the windows securely as placement advances.

High Resolution TIF (14 MB)


looking south

Nevada Approach and Arch headings as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 13.

Four sets of forestay cables span from the Arch ribs to the temporary pylons heads and the two sets of backstays span between the head and the backstay anchor blocks. Additional forestays and backstays are installed to the pylon heads, waiting tensioning as Arch construction progresses outward.

High Resolution TIF (14 MB)


looking south

Arizona Approach as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 12 with the form traveler advanced to segment 13 where construction crews place concrete for segment 13-LT. The concrete placing boom reaches out from segment 11 and directs pumped concrete into the formwork. Concrete is delivered by an 8cy bucket from the bridge deck at Pier 14 to the awaiting concrete pump at the skewback footing, where it is pumped up the North Arch rib in a pipe to the placing boom.
Four sets of forestay cables span from the Arch ribs to the temporary pylons heads and the two sets of backstays span between the head and the backstay anchor blocks.

High Resolution TIF (14 MB)


looking north

View of the Mike O’Callaghan-Pat Tillman Memorial Bridge as seen from downstream of Hoover Dam. Presently the Arch is approximately 50% complete.

Left side of the pictureThe Arch, constructed to segment 13, from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.
Right side of the pictureThe Arch, constructed to segment 12, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 14 and backstays span between the head and the backstay anchor block.

High Resolution TIF (14 MB)


looking north

On the Nevada Arch headings, Obayashi / PSM, JV crews launch the inner core of the form traveler and position it in place for the next segment to be constructed.

High Resolution TIF (14 MB)


looking northwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the deck of the bridge at Pier 14, looking towards Nevada.

Top Left side of the picture The left and right Arch ribs project outward from the Nevada skewback, currently constructed to segment 13.

Bottom of the picture The left and right Arch ribs in Arizona are visible, currently constructed to segment 13. Temporary stay cables, sheathed in white HDPE casing, extend down to the Arch from the temporary pylons above Pier 14.

High Resolution TIF (14 MB)

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Images from January 2009

Colorado River Bridge


looking west

Crews from Steel Engineers complete the relocation of the pre-assembled Arch Segment NV13-RT reinforcing steel cage from the fabrication template on the Arizona approach to a staging bed. This cage weighs approximately 25 tons.

High Resolution TIF (14 MB)


looking northwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the South side of Abutment 2 in Arizona.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. The right and left Arch ribs are constructed to segment 10 with the Arch strut installed at segment 7.

Center of the picture – The completed Nevada approach with the temporary pylons for the cable stays erected on top of Pier 5. The right and left Arch ribs are constructed to segment 12 with the Arch strut installed at segment 7.

Left side of the picture – Obayashi / PSM, JV survey crew set up to survey across the canyon to a rod man on the North Arch rib to make geometry control adjustments to the form traveler.

High Resolution TIF (14 MB)


looking northwest

At the top of the South temporary pylon in Arizona, Obayashi / PSM, JV crews utilize a winch system to pull into place backstay AO.

Visible at the right of this picture, forestays 3, 4, and 5 are installed, connecting to and supporting the right Arch rib.

High Resolution TIF (14 MB)


looking southeast

Looking down at the backstay anchor blocks, from the top of the South temporary pylon in Arizona, Obayashi / PSM, JV crews fabricate the next series of stay cables in the tray laying on the roadway alignment.

At the top of the picture, the North and South backstay anchor blocks are seen with stays DI and DO installed in each. Crews are preparing for the installation of backstays AI and AO.

Visible near the top right of the picture, the inner core launching rail of the right form traveler is being hoisted by the cableway crane for placement on the form traveler at the leading edge of the right Arch rib.

High Resolution TIF (14 MB)


looking southeast

Looking down on the Arch from the roadway deck above Pier 5 in Nevada, the right and left Arch ribs project outward over the Colorado River below.

The left and right Arch ribs are constructed out to segment 12 with reinforcing cages set for segments 12. Obayashi / PSM, JV carpenter crews prepare to launch the inner core formwork of the form travelers and install top slab formwork.

The Arch strut, connecting the two Arch ribs, is constructed at segment 7. On top of the Arch ribs, at this location, precast column segments for Pier 6 will be erected. A temporary bridge allows worker’s access to the Arch from the existing US93 near the Nevada hairpin area.

High Resolution TIF (14 MB)


looking south

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14 with forestay cables spanning from the Arch ribs to the temporary pylons heads and backstays spanning between the heads and the backstay anchor blocks.

The Arch is constructed to segment 10 in Arizona and to segment 12 in Nevada.

High Resolution TIF (14 MB)

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Images from December 2008

Colorado River Bridge


looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the deck of the bridge at Pier 5, looking towards Arizona.

The right and left Arch ribs are constructed out to segment 10. The left rib has the reinforcing steel cage set for segment 11. Visible at segment 7 is the steel strut member that connects both ribs together. Temporary stay cables, sheathed in white PVC casing, are attached to the arch ribs at segments 6, 8, and 10.

High Resolution TIF (14 MB)


looking north

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture The Arch, constructed to segment 10, from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

Right side of the pictureThe Arch, constructed to segment 10, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

High Resolution TIF (14 MB)


looking southwest

Left side of the picture The inner core of the Arizona South form traveler system, weighing approximately 30 tons, is removed from the Arch and carried by the South highline to the Arizona approach for form resurfacing.

Right side of the picture The two temporary pylons above Pier 14 rise 155′ above the bridge deck. These towers are part of the cable stay erection system that will support the arch ribs until closure.

High Resolution TIF (14 MB)


looking northwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) from the deck of the bridge at Pier 14, looking towards Nevada.

Top Left side of the picture The left and right Arch ribs project outward from the Nevada skewback.


Center Left side of the pictureThe inner core of the Arizona South form traveler system is being hoisted by the highline crane for resurfacing of the form panels.


Bottom of the picture The left and right Arch ribs in Arizona are visible with both inner core forms removed. Temporary stay cables, sheathed in white PVC casing, extend down to the Arch from the temporary pylons above Pier 14.

High Resolution TIF (14 MB)


looking west

On the Arizona approach, Obayashi / PSM, JV carpenter crews resurface the inner core of the form traveler.

High Resolution TIF (14 MB)

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Images from November 2008

Colorado River Bridge


looking south

Inside the Nevada left Arch rib, an Obayashi / PSM, JV carpenter constructs formwork for the diaphragm at Arch segment NV07-LT. The portal through the wall of the Arch rib will allow access to the strut.

High Resolution TIF (14 MB)


looking east

Inside the Nevada left Arch rib, an Obayashi / PSM, JV carpenter prepares to set formwork for the diaphragm at Arch segment NV07-LT. Water will be pumped through the grey tubing after concrete placement to cool the concrete during the curing period. The white ducts encase the post tensioning bars that will extend upwards through the exterior of the Arch rib, for the Pier 6 Left column.

High Resolution TIF (14 MB)


looking south

Arizona Approach as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 9 with the form traveler advanced to and preparing for construction of segment 10. The first and second sets of forestay cables span from segments 6 and 8 to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block. Connecting the two ribs at segment 7 is a temporary strut. This will remain in-place until the permanent strut is erected.

High Resolution TIF (14 MB)


looking east

As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the Colorado River. The form traveler systems are secured to segments NV10 and cantilevers out to form segment NV11. Forestay cables span from the Arch ribs to the temporary pylons above. The vertical post tensioning bars extend upwards from the Arch rib where Pier 6 will be erected.

High Resolution TIF (14 MB)


looking southwest

Nevada Approach and Arch headings as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 10. The first and second sets of forestay cables span from the Arch ribs to the temporary pylons heads and the first set of backstays span between the temporary pylon head and the backstay anchor block.

High Resolution TIF (14 MB)


looking northwest

View of an Arch strut as pre-assembled on the Arizona Approach. This strut will be transported by the cableway cranes where it will be erected between the Arch ribs at segment NV07.

High Resolution TIF (14 MB)


looking northeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen during night time operations from downstream of Hoover Dam.

Left side of the picture – The Arch, constructed to segment 10, from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

Right side of the picture – The Arch, constructed to segment 9, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

High Resolution TIF (14 MB)


looking southwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the roof of the Hoover Dam operations building.

Piers 15 and 14 appear to the left in this picture, while Pier 5 and 4 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14. The Arch projects outward from the skewback footings at the base of Piers 5 and 14 while the twin cableway cranes traverse the canyon above.

High Resolution TIF (14 MB)

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Images from October 2008

Colorado River Bridge


looking southeast

Looking across the canyon from the bridge deck above Pier 5, the left and right ribs of the Arizona Arch headings project outward from Pier 14 skewback footing. Above the bridge deck, the temporary pylons for the cable stays rise 155′. The pylon heads are accessed by climbing the scaffolding stairway, attached to the right pylon.

High Resolution TIF (14 MB)


looking south

Arizona Approach and Arch headings as viewed from the crest of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 8 with the form traveler advanced to and preparing for construction of segment 9. The first set of forestay cables span from the Arch to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block. The North cableway crane is lowering materials to the awaiting crews at the form travelers.

High Resolution TIF (14 MB)


looking south

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14. The Arch projects outward from the skewback footings at the base of Piers 5 and 14.

High Resolution TIF (14 MB)


looking southwest

Nevada Approach and Arch headings as viewed from the crest of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 9. The first and second sets of forestay cables span from the Arch ribs to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block.

High Resolution TIF (14 MB)


looking northwest

Looking across the canyon from the bridge deck above Pier 14, the left and right ribs of the Nevada Arch project outward from Pier 5 skewback footing. Above the deck, are the temporary pylons for the cable stays with two sets of stays set in place for each Arch rib. Beyond the pylons, the towers of the cableway cranes are luffted to the North and South to position the loads they are hoisting above their respective work areas. At the top left of this picture, chains are visible, hanging down from the South cableway crane hook.

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looking down

Looking down on the Arch from the roadway deck above Pier 5 in Nevada, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The left Arch rib is constructed out to segment 9 and awaits the advancement of the form traveler. A temporary bridge allows worker’s access to the Arch from the existing US93 near the Nevada hairpin area.

Right side of the picture – The right Arch rib is constructed to segment 8 and has the form traveler set for construction of segment 9. Obayashi / PSM, JV carpenter crews prepare to install top slab formwork.

High Resolution TIF (14 MB)


looking southeast

Inside the Nevada left Arch rib, Steel Engineer’s iron workers place reinforcing steel to construct the diaphragm at Arch segment NV07-LT. Directly above this diaphragm, on the exterior of the Arch rib, precast segments for Pier 6 Left will be erected.

Visible through the reinforcing steel, daylight shines in from the leading face of the form traveler.

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looking west

As seen from the leading edge of the Nevada left from traveler, the right traveler is set for construction of Arch segment NV10-RT. Looking back down the Arch, the curvature takes shape.

The right column of Pier 5 projects from the Nevada skewback footing. The fore cable stays, wrapped in white PVC sheathing, can be seen extending from the Arch, to the temporary pylons above Pier 5.

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Images from September 2008

Colorado River Bridge


looking northwest

Left side of the picture – From the bridge deck of the Arizona approach, a pre-assembled reinforcing cage for Arch segment NV07-RT is hoisted by the South Cableway Crane and carried across the canyon.

Right side of the picture – The temporary pylons for the cable stays are constructed on top of Pier 14. The backstay cables have been installed in the pylon head and await installation into the backstay anchor block.

High Resolution TIF (14 MB)


looking southeast

Crews from Steel Engineers prepare to set the pre-assembled reinforcing cage for Arch segment NV07-RT into the form traveler formwork.

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looking northeast

A carpenter foreman from the Obayashi / PSM, JV stands atop the leading edge formwork of Arch segment NV08-LT, conversing with crews working on the adjacent segment NV07-RT.

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looking east

Obayashi / PSM, JV’s crews install embedments into the top slab prior to completion of formwork for Arch segment NV07-RT.

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looking southeast

As seen from the Pier 5 skewback footing in Nevada, the left and right Arch ribs extend outwards towards Arizona with work continuing to cast segments NV07.

Across the canyon, columns of Pier 14 and the temporary pylons are visible.

High Resolution TIF (14 MB)


looking down

Looking down on the Arch from the roadway deck above Pier 14 in Arizona, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The right Arch rib is constructed out to segment 6. Using the Cableway Crane, iron workers place the pre-assembled reinforcing cage for segment 7.

Right side of the picture – The left Arch rib is constructed to segment 6 and has the form traveler set for construction of segment 7.

High Resolution TIF (14 MB)


looking southeast

Obayashi / PSM, JV’s crews constructing formwork for Arch segment NV07-LT.

Across the canyon, columns of Pier 14 temporary pylons, and the AZ Arch are visible along with the Cableway Crane, lowering the pre-assembled reinforcing cage for segment AZ-07 RT.

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looking south

Lower right side of the picture – A pre-assembled reinforcing cage for Arch segment AZ07-RT is hoisted by the South Cableway Crane and carried across the canyon past the Arizona right form traveler.

Center of the picture – The temporary pylons for the cable stays rise 155′ above the Arizona approach bridge deck at Pier 14. Temporary cable stays are installed from the Arch to the pylon head and will be used to support the Arch until the closure segment is constructed. Near the bottom, the left and right Arch ribs project outwards from the Pier 14 skewback footing, with the form travelers set for Arch segments AZ07 left and right.

High Resolution TIF (14 MB)


looking northeast

Arizona Approach as viewed from down stream of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 6 with the form traveler advanced to and preparing for construction of segment 7. The first set of forestay cables span from segment 6 to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block.

High Resolution TIF (14 MB)

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Images from August 2008

Colorado River Bridge


looking south

View of the Arizona approach as seen from the crest of Hoover Dam.

The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. At the base of Pier 14, the left Arch rib is visible.

High Resolution TIF (14 MB)


looking southeast

View of the pre-assembled arch reinforcing steel cages stockpiled on the Arizona approach.

High Resolution TIF (14 MB)


looking down

Looking down on the Arch from the roadway deck above Pier 14 in Arizona, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The right Arch rib is constructed out to segment 6 and awaits concrete placement.

Right side of the picture – The left Arch rib is constructed to segment 6 and has the concrete placing boom extended to the right Arch rib in preparation of concrete placement.

High Resolution TIF (14 MB)


looking north

Crews from Steel Engineers assembling arch reinforcing steel in a template on the Arizona approach.

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looking northwest

View of the temporary stay cable pylons constructed above Pier 14 in Arizona. Crews are working on erecting the stairway scaffolding to allow access to the pylon heads. Spanning overhead are the twin cableway crane systems.

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looking north

View of the Arch struts as stockpiled on the Arizona Approach. Once assembled, the strut will span between the Arch ribs to maintain alignment.

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looking south

As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the Colorado River. The form traveler systems are secured to segments NV06 and cantilevers out to form segment NV07. the form traveler on the right rib of the Arch has it’s left external form panel removed for maintenance.

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looking south

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14. The Arch projects outward from the skewback footings at the base of Piers 5 and 14.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the temporary pylons for the cable stays constructed on top of Pier 5. At the base of Pier 5, the right Arch rib is visible.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. At the base of Pier 14, the right and left Arch ribs are visible.

Spanning the canyon overhead are the twin cableway cranes.

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looking west

View of the constructed stay cables as they lay on the Nevada approach bridge deck, waiting insertion into the Arch and temporary pylon head. These cables are part of the cable stay erection system that will support the arch ribs until closure.

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Images from July 2008

Colorado River Bridge


looking west

Obayashi / PSM, JV’s temporary concrete batch plant, located in the Boneyard laydown area.

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looking northwest

View of the south temporary stay cable anchor and highline crane at the Abutment 1 area in Nevada. Utilizing steel beams, Obayashi / PSM crews construct trays for fabrication of the stay cables between the tower bases.

The south temporary stay cable anchor is exposed and is waiting installation of the stays. The south highline crane system is currently luffed to the north for delivery of materials to the Arch.

High Resolution TIF (14 MB)


looking down

Looking down on the Arch from the roadway deck above Pier 5 in Nevada, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The left Arch rib is constructed out to segment 6 and awaits the advancement of the form traveler. A temporary bridge allows worker’s access to the Arch from the existing US93 near the Nevada hairpin area.

Right side of the picture – The right Arch rib is constructed to segment 6 and has the form traveler set for construction of segment 7.

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looking southeast

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the temporary pylons for the cable stays constructed on top of Pier 5. At the base of Pier 5, the right Arch rib is visible.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. At the base of Pier 14, the right and left Arch ribs are visible.

Spanning the canyon overhead are the twin cableway cranes.

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looking up

Utilizing the cableway crane, Olsen Beal crews access the top of the temporary stay pylons in Arizona to complete erection of the pylon head assembly.

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looking south

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from the existing US93 in Nevada.

The completed Arizona approach is visible with the right and left Arch ribs cantilevered outward from the Arizona Skewback at the base of Pier 14.

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looking down

Looking down on the Arch from the roadway deck above Pier 14in Arizona, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The right Arch rib is constructed out to segment 4 and awaits final formwork and concrete placement for segment 5.

Right side of the picture The left Arch rib is constructed to segment 5 and awaits final formwork and concrete placement for segment 6. Below segment 5, a placing boom is attached to the Arch in preparation of concrete placement.

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Images from June 2008

Colorado River Bridge


looking south

View of the Pier 5 columns as seen from the existing US93 Hairpin in Nevada. Temporary scaffolding stairs allows access up the column to survey control points. To the left of the base of the scaffolding, the Arch form traveler system can be seen rising above the roadway elevation.

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looking south

As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the CO River. The fully configured form traveler systems are secured to segment NV05 and cantilevers out to form segment NV06.

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looking southwest

Visible from the base of the Hoover Dam, the Arch begins to take shape.

Left side of the picture – Arizona approach spans from Abutment 2 to Pier 14. The Arch projects outward from the Pier 14 skewback footing. Temporary pylons for the cable stay erection system are partially completed on the bridge deck above Pier 14.

Right side of the picture – The completed Nevada approach span from Pier 4 to Pier 5, along with the left and right ribs of the Arch are visible. Above Pier 5, the temporary pylons for the cable stay erection system can be seen.

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looking southwest

View of the partially completed 155′ tall temporary pylon at Pier 14. These towers are part of the cable stay erection system that will support the arch ribs until closure.

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looking west

The north highline crane system delivers the 6th precast segment to waiting Olsen Beal workers at the top of the temporary pylon on the right at Pier 14.

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Images from May 2008

Interim Surfacing on the Arizona & Nevada Approaches


looking west

View of the completed Nevada approach portion of the project between the Hoover Dam BOR Warehouse Bridge and the Hoover Dam Canyon Bridge.

At the center of the picture, Las Vegas Paving personnel perform clean up work near the Hoover Dam Lower Portal Road Bridge.

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looking east

View of the completed Nevada approach portion of the project between the Hoover Dam Canyon Bridge and the Hoover Dam BOR Warehouse Bridge.

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looking west

View of the completed Nevada approach portion of the project near the Nevada interchange as seen from the existing US93.

A Las Vegas Paving water truck readies to wash the roadway alignment in preparation for final project acceptance.

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looking west

View of the completed Nevada approach portion of the project as seen from the existing US93.

At the bottom left of the picture, the Hoover Dam Canyon Bridge is visible.

Near the top right of the picture, is the Nevada interchange, along with the Goldstrike Canyon Road.

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looking southeast

View of the completed Arizona approach portion of the project as seen from the Sugarloaf Mountain Bridge towards the Arizona Interchange.

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Colorado River Bridge…



looking northeast

Utilizing the highline crane system, Obayashi / PSM, JV workers hoist and prepare to erect the first segment of the 155′ tall temporary pylon at Piers 5 as part of the cable stay erection system that will support the arch ribs until closure.

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looking south

Obayashi / PSM, JV workers remove formwork and prepare to advance the form traveler system from the recently constructed left arch rib segment NV05 out to and reset for segment NV06.

Across the canyon, in Arizona, the left and right Arch ribs are visible projecting from the skewback footing, nearly 1000′ away.

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looking south

View of the left and right Arch ribs as they project from the Pier 5 skewback footing in Nevada.

Foreground – The left rib is currently constructed out to segment NV05.

Background – The right rib is currently constructed out to segment NV04.

Workers access the form system by the temporary stairs attached to the back of the arch ribs. As the Arch is constructed, additional stairs will be added.

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looking west

View of the Nevada approach span of the Mike O’Callaghan-Pat Tillman Memorial Bridge.

From left to right – The left and right ribs of the Arch project from the Pier 5 skewback footing. Piers 5 through 1 are completed along with the bridge deck spanning between them.

At the far right, the two towers of the twin highline crane system can be seen.

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looking west

Obayashi / PSM, JV workers perform final checks of the Bidwell concrete finishing machine prior to concrete placement for the deck of Arizona approach from Pier 15 to Abutment 2.

Foreground – A side discharge conveyor system spans across the deck to assist in concrete placement. The conveyor and the finishing system travels towards Abutment 2 while placing the freshly placed concrete.

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looking southwest

View of the Mike O’Callaghan-Pat Tillman Memorial Bridge alignment looking from Arizona towards Nevada.

Left side of the picture – Arizona approach spans from Abutment 2 to Pier 14. Olsen Beal crews install steel stay-in-place decking between the girders prior to deck reinforcement placement. Overhead, the highline crane system delivers materials to the work area.

Right side of the picture – Across the canyon, the completed Nevada approach span from Abutment 1 to Pier 5, along with the left and right ribs of the Arch are visible.

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looking north

Preparing for concrete placement, Obayashi / PSM, JV workers assemble the Bidwell concrete finishing machine on the Arizona approach.

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Images from April 2008

Interim Surfacing on the Arizona & Nevada Approaches


looking north

View of the completed pavement on the Arizona approach portion of the project looking towards the Sugar Loaf Mountain Bridge.

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looking southwest

Las Vegas Paving placing the first lift of asphalt pavement on the Nevada approach portion of the project.

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looking west

Arizona Highways Safety Systems driving posts for the guard rail in Nevada.

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looking north

On the Arizona approach, Arizona Highways Safety Systems install guard rail along the roadway alignment.

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looking south

Triple J Trenching constructing the slotted drain systems after the paving is completed on the Arizona approach portion of the project.

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Colorado River Bridge…



looking north

View of the bridge alignment looking towards Hoover Dam as seen from downstream of the dam.

Left side of the picture:
Completed Nevada approach span from Abutment 1 to Pier 5. At the bottom of Pier 5, the constructed Arch begins to project outward over the CO River.

Right side of the picture:
the Arizona approach span from Abutment 2 to Pier 14 near completion. At the bottom of Pier 14, the formwork for the Arch segments are visible.

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looking northeast

Nevada approach from Abutment 1 to Pier 5.

At the center of the picture, Obayashi / PSM, JV workers prepare for concrete placement for the bridge deck.

Near the top right, Olsen Beal crews install steel stay-in-place decking prior to deck reinforcement placement.

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looking west

Obayashi / PSM, JV workers pre-assemble and attach access platforms to precast temporary pylon towerheads.

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looking north

Ariel view of the Nevada approach from Abutment 1 to Pier 5. At the bottom of Pier 5, the form traveler form system is cantilevered from the completed Arch as it projects outward from the skewback.

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looking southeast

Ariel view of the Project alignment looking from Nevada towards Arizona.

In the foreground, the Nevada approach span of the Mike O’Callaghan-Pat Tillman Memorial Bridge is nearing completion. Obayashi / PSM, JV workers prepare for the final concrete pour to complete the bridge deck out to Pier 5.

In the background, the Arizona approach spans of the Mike O’Callaghan-Pat Tillman Memorial Bridge are visible along with the roadway alignment leading up to the bridge.

At the bottom center, the Pedestrian Plaza access ramp zigzags up the mountainside from the future parking lot to allow access to the bridge’s pedestrian walkway.

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looking south

View of the Arizona approach from Abutment 2 to Pier 14.

At the center of the picture, Olsen Beal crews install steel stay-in-place decking between the girders prior to deck reinforcement placement.

At the left, the two towers of the twin highline crane system can be seen.

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looking north

Ariel view of the bridge alignment looking towards Hoover Dam.

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Images from March 2008

Interim Surfacing on the Arizona & Nevada Approaches


looking south

Las Vegas Paving performing compaction of the asphalt pavement on the Arizona approach portion of the project.

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looking south

Las Vegas Paving placing the first lift of asphalt pavement on the Arizona approach portion of the project.

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Colorado River Bridge…



looking northwest

In Arizona, pre-assembled Arch reinforcing steel cages are stockpiled and await placement as part of an Arch segment.

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looking west

View of underside of bridge spans 1 and 2 as seen from the existing US93 hairpin in Nevada.

Working approximately 95′ above the ground, an Obayashi / PSM, JV worker attaches the temporary orange overhang falsework brackets to the outside of the steel girder of span 2.

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looking east

View of spans 3 and 4 as seen from the deck of the bridge.

In the foreground, Obayashi / PSM, JV workers survey grade and adjust the overhang falsework brackets on the outside of the steel girder of span 2.

In the background, Olsen Beal crews place stay in-place decking for bridge span 3, between piers 3 and 4.

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looking southwest

Utilizing the south cableway crane system, Olsen Beal crews transport and place steel stay in-place decking for bridge span 3, between piers 3 and 4. Hanging on temporary supports between the girders, the bridge deck drain piping system can be seen.

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looking southeast

View of the bridge alignment, looking from Nevada towards Arizona.

In the foreground, crews from Steel Engineers place reinforcing steel for the deck of span 1, between Abutment 1 and Pier 1.

In the background, Olsen Beal crews place stay in-place decking for bridge span 3, between piers 3 and 4.

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looking southeast

View of the bridge alignment from the existing US93 hairpin in Nevada looking towards Arizona.

In the foreground, Obayashi / PSM, JV workers place concrete for Arch segment NV04-Left

In the background, across the Colorado River, the Arizona Arch segments, along with Pier 14 columns are visible, approximately 1100′ away.

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looking south

As seen from the existing US93 hairpin in Nevada, during a night shift operation, a concrete pump truck delivers concrete to Obayashi / PSM, JV workers for placement at Arch segment NV04-Left.

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looking northwest

View of a pre-assembled reinforcing steel cage being delivered to Arch segment NV03-Right from the Abutment 2 area in Arizona. This 25′ long cage weighs approximately 32,000 pounds and is delivered across the canyon with the south cableway crane system.

Visible just below the cage is the trolley assembly of the north cableway crane system.

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Images from February 2008

Interim Surfacing on the Arizona & Nevada Approaches


looking southeast

View of the Arizona approach roadway prior to aggregate base placement. On ramp B, near the Arizona interchange, Triple J Trenching is visible excavating and installing conduits for future electrical crossings.

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looking west

Triple J Trenching crews place and compact backfill material for installation of conduits for future electrical crossings on the Arizona approach.

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looking northwest

On the Nevada approach, Las Vegas Paving is hauling, placing, and compacting aggregate base material onto the Nevada approach roadway alignment near the Nevada interchange.

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looking west

View of a haul truck placing aggregate base material onto the Nevada approach roadway alignment near the Hoover Dam Canyon Bridge.

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looking south

Las Vegas Paving shaping aggregate base material prior to compacting on the Nevada approach roadway alignment.

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Colorado River Bridge…


looking east

The final span 2 steel girder is being transported from the abutment 1 area for placement in span 2. This girder is approximately 100′ long and weighs 45 tons.

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looking north

Olsen Beal crews prepare cable rigging for hoisting and erecting steel girders for the Nevada approach.

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looking west

Delivery of the steel girders for the Nevada approach.

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looking east

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from abutment 1 in Nevada.

Steel girders for span 1 are erected with 3 of the 4 placed for span 2.

Olsen Beal crews are transported in a man basket to pier cap 3 in preparation for erection of the final girder for span 2.

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looking northwest

View of the Nevada approach columns with steel girders in span 2 erected along with 2 of the 4 girders erected in span 3.

At the bottom of Pier 5, the completed Arch is visible cantilevered off of the NV skewback footing.

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looking northwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible with steel girders in-place for spans 1, 2, and 3. Near the bottom of Pier 5, newly constructed Arch segments cantilever off of the NV skewback footing.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement completed. Below Pier 14, on the AZ skewback, formwork cantilevers off of the footing.

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Images from January 2008

Colorado River Bridge…


looking southeast

Olsen Beal crews look on as the North highline crane hoists a 50 ton concrete certification weight.

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looking southeast

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from abutment 1 in Nevada.

Center – The completed Pier 1 cap is awaiting steel girder placement. System scaffolding encases the right column of Pier 1.

Above the pier cap, the North highline crane is being certified prior to use with a 50 ton concrete block test load.

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looking southeast

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from abutment 1 in Nevada. Both operational highline cranes can be seen in their fully constructed configuration.

Near the bottom of the photograph, piers caps for Piers 1, 2, 3, and 4 are visible.

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looking northwest

View of the CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) progress as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible awaiting steel girder placement.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement nearing completion.

Spanning the canyon above the Approaches, the 3❞ track cables of the highline cranes are visible.

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looking south

The 50 ton concrete block test load traverses the canyon via the north highline crane.

At the left of the photograph, the Arizona approach is visible.

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looking north

Crews from Steel Engineers assembling arch reinforcing steel in a template on the Arizona approach.

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looking southwest

Obayashi / PSM, JV field engineer performs construction surveying from the existing US93 near the Nevada hairpin area.

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looking northwest

View of the assembled precast temporary stay cable towerhead. These towerheads will be constructed on top of a 130′ tall temporary tower at Piers 5 and 14 as part of the cable stay erection system that will support the arches until closure. At the completion of arch construction, they will be removed along with the temporary stay cables.

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Images from December 2007

Colorado River Bridge…


looking southwest

View of the Nevada approach columns of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the existing US93 in Arizona.

From left to right:
In Arizona – Olsen Beal crews utilize a Manitowoc 2250 crane to assemble the trolley and attach the slack carriers for the highline crane system

Piers 5, 4, 3, 2, 1 – columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right.

In Nevada – Olsen Beal crews utilize a Manitowoc M250 crane to perform work on the Nevada side of the highline crane system.

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looking south

At the NV skewback footing, Obayashi / PSM, JV crews assemble the form traveler to its full configuration onto the left Arch rib in preparation for construction of the third segment.

To the right of this picture, an additional crew assembles formwork in preparation for construction of right Arch rib segment two.

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looking southeast

High above the roadway alignment in Nevada, Olsen Beal crews continue construction of the new highline crane systems.

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looking south

Utilizing a Manitowoc M250 crane located in the abutment 1 area in Nevada; Olsen Beal crews attach the slack carriers onto the 3❞ cables of the South highline crane system.

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looking northeast

In Arizona, steel girders make up a reinforcing steel fabrication jig. On the exterior of this jig, iron workers will assemble Arch segment reinforcing steel cages. Once complete, the cages will be lifted off of the end of this jig and transported out to the form traveler and placed as part of an Arch segment.

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looking southwest

In Arizona, high above the roadway alignment at Abutment 2, Olsen Beal crews construct the highline crane system by attaching the trolley and slack carriers to the 3❞ cables that span the canyon.

Below Pier 14, on the AZ skewback, formwork cantilevers off of the footing in preparation for an arch segment concrete placement.

High Resolution TIF (14 MB)


looking northeast

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible awaiting steel girder placement. Near the bottom of Pier 5, newly constructed Arch segments cantilever off of the NV skewback footing.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement completed.

The towers of the new highline crane system can bee seen to the edge of the picture, along with their 3❞ cables spanning the canyon between them.

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looking southwest

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from upstream of Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right.

Steel girders are in-place for the approach spans in Arizona while crews construct the new highline crane system.

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Images from November 2007

Colorado River Bridge…


looking north

In the contractor’s laydown yard, Obayashi / PSM, JV crews prepare formwork to cast concrete panels for the exterior of the Arch strut steel frames. A completed panel is hoisted by crane and transported to the staging area, awaiting erection.

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looking west

In Nevada, Olsen Beal crews reeve cabling through an 18 part block and tackle system for the backstay cable of the south highline crane system.

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looking northwest

Nicholson Construction continue to drill through pipe sleeves and nearly 60′ into solid rock to install post tensioning strand for the Arizona left temporary backstay anchor block.

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looking west

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) alignment as seen from the existing US93 hairpin in Nevada.

Piers 4, 3, 2, 1 – columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right. Beyond Abutment 1, projects the towers of the twin highline crane systems. Viewable high above the pier caps, the 3❞ diameter track cables for the new highline system span the canyon between the Nevada and Arizona highline towers.

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looking west

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

In the foreground, steel girders span between Abutment 2 to Pier 15, then from Pier 15 to Pier 14.

Across the canyon, the two white towers of the twin highline crane systems can be seen in Nevada.

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looking south

View of half of the lower support structure of the form traveler system as it is being prepared for installation onto the left Arch rib in Nevada. This support structure forms the bottom of the Arch segment while concrete is placed.

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looking west

In Nevada, Olsen Beal crews reeve cabling through an 18 part block and tackle system for the backstay cable of the south highline crane system.

High Resolution TIF (14 MB)



looking west

Utilizing a Manitowoc 2250 crane located in the abutment 2 area in Arizona; Olsen Beal crews continue assembling the new highline crane system.

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Images from September & October 2007

Colorado River Bridge…


looking west

Utilizing a Manitowoc 2250 crane located in the abutment 2 area in Arizona; Olsen Beal crews disassemble and prepare the S-70 Derrick Crane for removal and demobilization.

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looking south

View of the new slack carriers awaiting installation on the highline crane system.

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looking west

View of the completed Nevada towers for the new highline crane system located at the abutment 1 area in Nevada. These towers are 335′ tall.

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looking northeast

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

At the right of the picture, red temporary bracing project out from span 15 to form the deck overhang.

Across the canyon, a Manitowoc 2250 crane located at the Nevada hairpin on existing US93 delivers materials and workers to the top of Pier 5. Visible beyond it are the columns of the Nevada approach and new highline crane towers.

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looking south

View of the Nevada approach columns as seen from the crest of Hoover Dam.

From left to right:

Pier 5 – At the top, Obayashi / PSM, JV personnel stress the pier cap transverse post tensioning. At the bottom, formwork projects outward from the skewback footing, forming the first two segments of the Arch.

Piers 4, 3, 2, 1 – columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right. Beyond Abutment 1, projects the tops of the twin highline crane systems.

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Images from August 2007

Colorado River Bridge…


looking west

View of the erected steel girders for spans 15 and 16 as seen from Abutment 2 in Arizona. The bridge deck elevation will be approximately 9❞ above the girders top flange. In the background, Olsen Beal erects the Nevada towers for the new highline crane system.

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looking west

Obayashi / PSM, JV crews continue to construct overhang brackets and formwork onto the edge of the span 16 girder.

Across the canyon, in the abutment 1 area in Nevada, Olsen Beal crews erect the Nevada towers for the new highline crane system. To the right of this picture, the Manitowoc 2250 crane located at the Nevada hairpin on existing US93 is stored in it’s laid down, non-use configuration.

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looking west

View of the Nevada approach columns of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the existing US93 in Arizona.

From left to right:
Pier 5 – System scaffolding encases the right column for concrete finishing operations. At the bottom of Pier 5, formwork projects outward from the skewback footing, forming the first two segments of the Arch.
Piers 4, 3, 2, 1 – columns are complete with their pier cap visible above the cap falsework.
Abutment 1 – can be seen to the far right.

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looking south

Utilizing a Manitowoc M250 crane located in the abutment 1 area in Nevada; Olsen Beal crews erect the Nevada towers for the new highline crane system. The one on the left is currently 240′ while the one on the right is 160′ tall. When completed these towers will top out at 335′ in height.

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looking south

Obayashi / PSM, JV utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to remove the temporary bracing between piers 14 and 15 through an opening in the steel girder alignment. Once complete, the final girder of span 15 will be set.

At the bottom left of this picture, crews continue to form the foundation blocks of the Arizona towers for the new highline crane system.

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looking west

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

In the foreground, at the abutment 2 area, work continues on construction of the foundation blocks of the Arizona towers for the new highline crane system, along with the completion of girder erection for spans 15 and 16.

Across the canyon, a Manitowoc 2250 crane located at the Nevada hairpin on existing US93 delivers materials and workers to the top of Pier 5. Visible beyond it are the columns of the Nevada approach.

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looking northeast

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible awaiting steel girder placement.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement nearing completion.

High Resolution TIF (14 MB)

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Images from July 2007

Colorado River Bridge…


looking east

View of new stockpiled Cableway Crane cables located on the Nevada approach awaiting erection.

High Resolution TIF (14 MB)



looking south

Nicholson Construction utilizing a Manitowoc M250 crane to transport drilling equipment and materials to the location of the luffing guy anchor block for the new Cableway Crane system near the Abutment 1 area.

High Resolution TIF (14 MB)


looking south

Utilizing the Manitowoc 2250 crane located at the Nevada hairpin on existing US93, Olsen Beal crews construct falsework for the Pier 5 cap. Workers walk the steel beams situated 860′ above the Colorado River.

System scaffolding encases the columns of Pier 5 to allow access for grouting and concrete finishing operations.

To the right of Pier 5, Pier 4 can be seen.

High Resolution TIF (14 MB)



looking south

Obayashi / PSM, JV utilizing the S-70 Derrick Crane and a yellow man basket at Abutment 2 in Arizona to access the Pier 14 skewback footing where crews continue to form Arch segments.

Above the man basket, the formwork for Pier 14 pier cap can be seen. Concrete placement for this cap took place during the night time hours on July 20, 2007.

To the left of Pier 14, completed Pier 15 along with its cap can be seen.

High Resolution TIF (14 MB)


looking northwest

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

Across the canyon, a Manitowoc 2250 crane delivers materials and workers to the top of Pier 5. At the bottom of Pier 5, formwork projects outward from the skewback footing, forming the first two segments of the Arch. The blue formwork is the inner core of the Arch form traveler system. This system will be utilized to form the hollow inner portion of the Arch.

High Resolution TIF (14 MB)



looking southwest

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) as seen from the existing US93 hairpin in Nevada. From left to right:

Pier 5 – system scaffolding encases the columns for grouting and concrete finishing operations. At the pier cap, carpenters continue to set falsework.

Piers 4, 3, 2, 1 – columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right.

High Resolution TIF (14 MB)

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Images from June 2007

Colorado River Bridge…


looking west

Olsen Beal crews erecting precast segments for Pier 14 left column.

Visible to the right and left are the completed columns of Pier 15.

High Resolution TIF (14 MB)



looking west

View of the formwork for the Pier 15 cap, ready for concrete placement.

In the background, visible between Pier 15 columns, Olsen Beal crews continue erecting precast segments for Pier 14 left.

High Resolution TIF (14 MB)


looking south


View of Piers 14 and 15 as seen from the crest of the Hoover Dam.

Olsen Beal crews utilizing the S-70 Derrick crane at Abutment 2 in Arizona to transport precast segments and erect Pier 14 left column.

To the left of Pier 14, the completed columns of Pier 15 along with the formwork for the cap can be seen.

High Resolution TIF (14 MB)



looking south

Olsen Beal utilizing the Manitowoc 2250 crane located at the Nevada hairpin on existing US93 to erect precast segments for Pier 5 left column.

High Resolution TIF (14 MB)


looking southwest

View of precast column segments, delivered to the Abutment 2 area, in preparation for transport to their respective columns by the S-70 Derrick crane.

High Resolution TIF (14 MB)



looking south

View of the bridge alignment as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right.

High Resolution TIF (14 MB)


looking southwest

View of the delivered steel box girders, staged at the Abutment 2 area.

High Resolution TIF (14 MB)



looking north

Obayashi / PSM, JV continuing to assemble the inner core form of the Arch form traveler system. This system will be utilized to form the hollow inner portion of the Arch.

High Resolution TIF (14 MB)


looking north

Subcontractor, Nicholson, drilling holes for the rock anchors of the new highline back stay anchor located in Arizona near abutment 2.

High Resolution TIF (14 MB)


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Images from May 2007

Colorado River Bridge…


looking east

Olsen Beal utilizing the S-70 Derrick crane at Abutment 2 in Arizona to transport precast segments and erect Pier 14 right column.

Visible above Pier 14 is the completed columns of Pier 15.

High Resolution TIF (14 MB)



looking south

Olsen Beal utilizing the Manitowoc 2250 crane located at the Nevada hairpin on existing US93 to erect precast segments for Pier 5 right column.

Visible to the right of Pier 5 is the completed columns of Pier 4.

High Resolution TIF (14 MB)


looking west

View of the South temporary stay cable anchor block located in Arizona near Abutment 2.

High Resolution TIF (14 MB)



looking southeast

View of the bridge alignment at abutment 1.

From left to the right –
Completed Pier 2 can be seen with the formwork removed from its pier cap. Pier 1 has the falsework in place waiting for reinforcing steel / formwork to construct the pier cap. The temporary stay cable anchor blocks are visible in the roadway alignment to the right of the abutment. Near the yellow Grove crane, the old Highline Crane tower foundations are being prepared for removal by blasting.

To the left of the temporary stay cable anchor blocks, the Pedestrian Access ramp zigzags up the mountainside from the future access parking lot where the construction office trailers are currently located.

High Resolution TIF (14 MB)


looking northeast

View of the bridge alignment looking towards Hoover Dam.

Left side of the picture
Completed Pier 2, 3, and 4. Pier 5 right / left columns are in various stages of erection. Falsework for the Arch cantilevered off of the Pier 5 skewback footing.

Right side of the picture
Falsework for the Arch cantilevered off of the Pier 14 skewback footing. Pier 14 right / left columns are in various stages of erection. The S-70 Derrick crane is setting precast segments for the Pier 15 left column from Abutment 2. Pier 15 right column is competed.

High Resolution TIF (14 MB)



looking northwest

View of the bridge alignment looking from Abutment 2 (Arizona) towards Abutment 1 (Nevada).

Foreground: completed Pier 15 columns are wrapped in scaffolding.

Background: Falsework for the Arch is cantilevered off of the Pier 5 skewback footing. Above the falsework, Pier 5 can be seen with crew erecting segments for the right column. Pier 4 is visible with the pier cap falsework in place.

High Resolution TIF (14 MB)


looking northwest

Looking down at Pier 5 skewback footing on completed Arch segments NV01 Right and Left. The falsework for segments 2 projects out over the canyon, ready for formwork / reinforcing steel placement.

High Resolution TIF (14 MB)



looking northwest

View of the bridge alignment looking from Abutment 2 (Arizona) towards Abutment 1 (Nevada) from above Abutment 2.

Foreground: Excavations for the temporary stay cable anchor blocks are visible in the roadway alignment near the footing of the S-70 Derrick crane. The crane is currently setting precast segments for the erection of Pier 15 left column.

Background: Pier 5 and the Arch segments in various stages of construction. Next are the completed Pier 4, 3, 2. Pier 1 that can be seen with the falsework in place for the pier cap construction. Abutment 1 is visible behind Pier 1.

High Resolution TIF (14 MB)


looking northwest

Looking down on Olsen Beal crews preparing to set the next precast segment at Pier 5 right as they work 230 feet above the skewback footing.

Visible below are the completed Arch segments NV01 Right and Left along with the falsework for segments 2.

High Resolution TIF (14 MB)


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Images from April 2007

Colorado River Bridge…


looking east

Olsen Beal utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to transport precast segments and erect Pier 15 right and left columns.

Visible below Pier 15 is the skewback footing of Pier 14 with the falsework for the Arch protruding outward.

High Resolution TIF (14 MB)



looking west

View of the South temporary stay cable anchor block located in Nevada near Abutment 1.

High Resolution TIF (14 MB)



looking west

View of delivered concrete being cooled with liquid Nitrogen prior to placement for construction of the Arch segment NV01-RT.

High Resolution TIF (14 MB)



looking southwest

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) alignment as seen from the existing US93 hairpin in Nevada.

Abutment 1 in final stages of construction with the blockouts for the tie back anchors remaining to be filled.

Pier 1 is shown with falsework for the pier cap in place.
Pier 2 can be seen with the completed pier cap.
Pier 3 is visible with the completed pier cap along with climbing scaffolding surrounding the columns.
Pier 4 is visible with the completed pier cap.

High Resolution TIF (14 MB)

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Images from March 2007

Colorado River Bridge…



looking west

Workers from Jake’s Crane prepare for the removal of the counter weights from the Link Belt TG1900 erected on the Pier 15 left foundation. This worker is attaching hoisting slings onto the weights wile perched nearly 865′ above the Colorado River.

High Resolution TIF (14 MB)



looking south

Obayashi / PSM, JV utilizing a Manitowoc 2250 crane to construct / access Piers 3 and 4 from the Nevada hairpin on existing US93.

High Resolution TIF (14 MB)



looking west

View of the bridge alignment as seen from Arizona towards Nevada.

Piers 1, 2, 3, 4, 5 in various stages of completion. Formwork for Arch segments NV01N and NV01S can be seen cantilevered off of the Pier 5 (NV skewback) footing.

High Resolution TIF (14 MB)



looking southwest

Jake’s Crane utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to dismantle the Link Belt TG1900 from the Pier 15 left foundation.

Visible to the left of the crane is Pier 15 right in partial stage of completion.

High Resolution TIF (14 MB)



looking north

Crane close-up.

High Resolution TIF (14 MB)



looking north

Workers from Jake’s Crane utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to dismantle the Link Belt TG1900 from the Pier 15 left foundation. Crews are removing the boom section and transporting it to the laydown area on the Arizona approach roadway.

High Resolution TIF (14 MB)



looking east

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) alignment as seen from Nevada, looking towards Arizona.

Abutment 1 in final stages of construction with the blockouts for the tie back anchors remaining to be filled.

Pier 1 is shown with falsework for the pier cap in place.

Pier 2 can be seen with formwork for the pier cap in place. Concrete placement for the cap was performed on August 21, 2006.

Pier 3 is visible with formwork for the pier cap in place. Concrete placement for the cap was performed on March 27th.

Pier 4 is visible with formwork for the pier cap in place. Ironworkers are placing reinforcing steel for the cap.

High Resolution TIF (14 MB)

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Images from February 2007

Colorado River Bridge…



looking northwest

Dielco Crane assembles and attaches the luffing jib to the Manitowoc 2250 crane at the existing US93 near the hairpin in Nevada.

High Resolution TIF (14 MB)



looking north

Dielco Crane assembling a Manitowoc 2250 crane to be utilized at the existing US93 near the hairpin in Nevada.

High Resolution TIF (14 MB)



looking south

Obayashi / PSM, JV personnel constructing falsework for the Pier 4 pier cap in the work access area of the existing US93 near the hairpin in Nevada.

High Resolution TIF (14 MB)




Overall View #1

.

High Resolution TIF (14 MB)




Overall View #2

.

High Resolution TIF (14 MB)



looking west

Obayashi / PSM, JV and Olsen Beal personnel assembling the 70 foot mast for the S-70 Derrick Crane near Abutment 2 in Arizona.

High Resolution TIF (14 MB)



looking southwest

Obayashi / PSM, JV and Olsen Beal prepare to raise and install the 70 foot mast for the S-70 Derrick Crane near Abutment 2 in Arizona.

High Resolution TIF (14 MB)



looking east

View of the future CO River Bridge (Mike O’Callaghan-Pat Tillman Memorial Bridge) alignment as seen from Nevada, looking towards Arizona. Visible to the lower left of this photograph is the nearly completed pedestrian access ramp as it zigzags up the mountain side onto the alignment near Abutment 1.

High Resolution TIF (14 MB)



looking north

View of the bridge alignment as seen from downstream of the Hoover Dam.

Left Center: Piers 1, 2, 3, 4, 5 in various stages of completion. Formwork for Arch segments NV01N and NV01S can be seen cantilevered off of the Pier 5 (NV skewback) footing.

Right Center: Pier 14 (AZ skewback) footing, Pier 15, and abutment 2 are visible. The Link Belt TG1900 Tower Crane remains erected on the left footing foundation of Pier 15.

High Resolution TIF (14 MB)



looking northeast

Ladd & Associates place back fill material at Abutment 1 in Nevada.

High Resolution TIF (14 MB)



looking south

Obayashi / PSM, JV utilizing a Manitowoc 2250 crane to construct / access Piers 3 and 4 from the Nevada hairpin on existing US93.

High Resolution TIF (14 MB)



looking south

Subcontractor, Nicholson, drilling holes for the rock anchors on the north temporary backstay anchor block in Nevada near abutment 1.

High Resolution TIF (14 MB)

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Images from January 2007

Colorado River Bridge…



looking west

Obayashi / PSM, JV personnel stockpiling system scaffolding materials in the work access area of the existing US93 near the hairpin in Nevada.

High Resolution TIF (14 MB)



looking east

View of the S-70 Derrick Crane bracing to be erected near Abutment 2 in Arizona. This crane will be utilized to erect Piers 14 and 15 and construct portions of the Arch from the Arizona side of the canyon.

High Resolution TIF (14 MB)




Obayashi / PSM, JV crews place concrete to construct the south Back Stay Anchor block near Abutment 1 in Nevada.

High Resolution TIF (14 MB)



looking west

Obayashi / PSM, JV utilizing a Grove GMK6350 truck crane to remove system scaffolding from Pier 2 left.

From left to right appear Pier 4 left with system scaffolding erected around its column, Pier 3 has climbing scaffolding attached to allow access for grouting / finishing operations, Pier 2 is currently having the system scaffolding removed. Behind Pier 2, Pier 1 and Abutment 1 can be seen.

High Resolution TIF (14 MB)

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Images from November/December 2006

Colorado River Bridge…



looking west

View of the bridge alignment looking from Abutment 2 (Arizona) towards Abutment 1 (Nevada).

Foreground: Reinforcing steel for the Abutment 2 backwall protrudes upwards. Further out, Pier 15 Right in the current erection stage while the Link Belt TG1900 tower crane remains erected on Pier 15 Left footing.

Background: Pier 5 is in the erection stage. Behind Pier 5, Pier 4 is visible with the pier cap falsework in place.

High Resolution TIF (14 MB)



looking north

View of Nevada Approach piers as seen from the Colorado River elevation just downstream of the Hoover Dam. Visible from the left to the right are Piers 1 through 5. The formwork for the arch starter segments is cantilevered off of the Pier 5 skewback footing, protruding out over the canyon wall. Temporary bracing spans between Piers 2 to Pier 4. Once Pier 5 is erected to the temporary bracing elevation, additional sections will be set to connect to Pier 4.

High Resolution TIF (14 MB)



looking north

Obayashi / PSM, JV and Cross Marine Projects utilizing a crane and dive team to remove fallen Cableway Crane System debris from the Colorado River. Crews were staged at the river’s edge on top of the Hoover Dams’ Nevada spillway tunnel structure.

High Resolution TIF (14 MB)



looking southeast

View of Arizona Approach as seen from the existing US93 near the hairpin in Nevada.

High Resolution TIF (14 MB)



looking southwest


Obayashi / PSM, JV utilizing a Grove GMK6350 truck crane to access Piers 3 through 5 from the existing US93 at the hairpin turn in Nevada. From left to right appear Pier 4 with its pier cap falsework partially constructed, Pier 3 has climbing scaffolding attached to allow access for grouting / finishing operations, and Pier 2 has system scaffolding erected around its columns to allow access to the pier cap. Behind Pier 2, Pier 1 and Abutment 1 can be seen.


High Resolution TIF (14 MB)



looking southwest

View of Hoover Dam and Nevada Approach as seen from the Hoover Dam visitor parking area in Arizona.

High Resolution TIF (14 MB)

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Images from October 2006

Colorado River Bridge…



looking southeast

Obayashi / PSM, JV personnel loading the last segments of the collapsed South Cableway Crane towers at the Abutment 1 area in Nevada.

High Resolution TIF (14 MB)



Obayashi / PSM, JV personnel are utilizing a crane to access Pier 4 to remove a temporary protection beam from the side of the columns.

To the right of Pier 4, visible is Pier 3 with access scaffolding projecting up from the ground.

Behind Pier 3, Pier 2 can be seen with its completed pier cap in place.

High Resolution TIF (14 MB)


looking east


View of Abutment 1 with backfilling operation nearing completion.

High Resolution TIF (14 MB)


looking west

Ladd & Associates utilizing hoppers to transport backfill material for the backfilling of Abutment 2.

High Resolution TIF (14 MB)



looking west

View of the approach spans looking from Pier 5 to Abutment 1 as seen from the Nevada hairpin on existing US93.

High Resolution TIF (14 MB)

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Images from September 2006

Colorado River Bridge…


View of the collapsed North and South Cableway Crane system looking from Nevada towards Arizona.

High Resolution TIF (14 MB)


View of the collapsed North and South Cableway Crane system at Abutment 2 area in Arizona.

High Resolution TIF (14 MB)

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Images from August 2006

Colorado River Bridge…


View of the Colorado River Bridge alignment looking East from Nevada towards Arizona.

Pictured from left to right:
Abutment 1 in final stages of construction.
Pier 1 is shown with falsework for the pier cap in place.
Pier 2 is shown with pier cap formwork in place ready for concrete placement.
Pier 3 is shown with falsework for the pier cap in place.
Pier 4 is in the erection stage awaiting falsework for the pier cap.
Pier 5 right is in the erection stage

High Resolution TIF (14 MB)



View of the bridge alignment looking East from Nevada towards the Arizona side of the canyon.

From the bottom to the top:
Pier 14 Skewback footing is complete. On the temporary work platform, Nicholson Construction is drilling for the temporary tie back anchors through the footing into the canyon wall.

A Link Belt TG1900 tower crane is erected on Pier 15 left footing. Pier 15 right is in its initial stages of erection with several segments placed.

The formwork for Abutment 2 appears near the center of this picture.

High Resolution TIF (14 MB)



The bridge alignment looking West from Arizona towards the Nevada approach spans. Pictured from bottom to top.

Visible is the formwork for the Arch starter segments attached to the Pier 5 Skewback footing. Above the footing, crews on Pier 5 continue to erect precast segments. All of the precast segments for Piers 1 through 4 have been erected and the pier caps are in various stages of construction. Grey colored temporary bracing can been seen attached between Pier 4 and Pier 3 and between Pier 3 and Pier 2. Overhead, the cableway cranes provide personnel access and material deliveries to the pier columns.

High Resolution TIF (14 MB)



Looking East

Ladd & Associates in the process of backfilling the Abutment 1. Projecting on an angle through the right retaining wall and the abutment are the tie back anchors. Visible through Abutment 1 backwall reinforcing steel is the falsework for the Pier 1 pier cap and the formwork for the Pier 2 pier cap.

High Resolution TIF (14 MB)


Looking Southwest

View of the Abutment 2 stem wall in preparation for concrete placement after formwork and reinforcing steel have been constructed.

High Resolution TIF (14 MB)



Looking West


View of the approach spans looking from Pier 4 to Abutment 1 as seen from the Nevada hairpin on existing US93.

High Resolution TIF (14 MB)

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Images from July 2006

Colorado River Bridge…


(looking east)

View of the Colorado River Bridge alignment looking from Nevada towards Arizona. Pictured from left to right:

Abutment 1 in final stages of construction. Formwork for panels 1 and 3 of the nearly 57′ tall retaining wall being placed.
Pier 1 is shown with falsework for the pier cap in place.
Pier 2 is shown with falsework for the pier cap in place.
Pier 3 is in the erection stage.
Pier 4 is in the erection stage awaiting temporary wind bracing placement.

High Resolution TIF (14 MB)


(looking south)

Obayashi / PSM, JV personnel placing concrete for the Pier 14 footing (Arizona skewback). Nearly 2200 cubic yards of concrete was placed, all of which was pumped though the twin 700′ long pipes (slick line) extending from the Abutment 2 area into Pier 14 which can be seen bolted to the excavation wall.

Reinforcing steel for the South arch is visible extending out of the face of the formwork.

High Resolution TIF (14 MB)


(looking east)

Obayashi / PSM, JV personnel placing concrete for the Pier 14 footing (Arizona skewback). Two 32 meter concrete placing booms were utilized to accurately distribute the concrete into the formwork.

Reinforcing steel for the North arch is visible extending out of the face of the formwork.

High Resolution TIF (14 MB)


(looking south)

Obayashi / PSM, JV personnel working late into the night placing concrete for the Pier 14 footing (Arizona skewback).

High Resolution TIF (14 MB)


(looking southwest)

View of the Nevada approach columns looking from Pier 4 to Abutment 1.

High Resolution TIF (14 MB)


(looking east)

At the Liquid Nitrogen (LN2) cooling station, Liquid Nitrogen is being injected into concrete mixer trucks to cool the freshly batched concrete.

High Resolution TIF (14 MB)


(looking southwest)

Olsen Beal utilizing the two cableway cranes in tandem to erect the temporary bracing between Pier 2 and 3.

High Resolution TIF (14 MB)

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Images from June 2006

Colorado River Bridge…


(looking east)

View of the Colorado River Bridge alignment looking from Nevada towards Arizona. Pictured from left to right:

Abutment 1 in final stages of construction. Formwork for the second lift on the retaining wall being placed.

Pier 1 is shown with falsework for the pier cap in place.

Pier 2 is erected to pier cap elevation.

Pier 3 is in the erection stage awaiting temporary wind bracing placement.

Pier 4 right, Olsen Beal crews utilizing the cableway crane to set a precast segment.

High Resolution TIF (14 MB)


(looking southeast)

View of the bridge alignment looking towards the Arizona side of the canyon. From the bottom to the top:

Pier 14 Skewback footing formwork is completed awaiting concrete placement. As seen to the right of the excavation, twin 700′ long pipes (slick line) extend from the Abutment 2 area into Pier 14 for placement of concrete by pumping.

A Link Belt TG1900 tower crane is erected on Pier 15 left footing.

The formwork for Abutment 2 appears near the center of this picture.

High Resolution TIF (14 MB)


(looking southeast)

Precast column segments staged near abutment 1 awaiting placement for the approach span columns.

High Resolution TIF (14 MB)


(looking southwest)

Left: Olsen Beal personnel utilizing the cableway crane to set another segment for the Pier 4 right column.

Center: Crews from Jake’s Crane dismantling the Link Belt TG1900 tower crane erected on Pier 4 left footing.

Right: Temporary scaffolding is attached to the sides of Pier 3 left column to provide access during final stages of erection. This scaffolding is utilized during segment erection and subsequent post tensioning bar grouting operations.

High Resolution TIF (14 MB)


View of the approach spans looking from Pier 3 to Abutment 1.

High Resolution TIF (14 MB)


(looking northwest)

View of the approach spans looking from Pier 3 to Abutment 1.

High Resolution TIF (14 MB)


(looking south)

Close up view of Olsen Beal personnel setting a precast segment for the Pier 4 right column.

High Resolution TIF (14 MB)


(looking northwest)

The bridge alignment looking from Arizona straight towards the Nevada approach spans. Pictured from bottom to top.

Nicholson Construction drilling for the temporary tie back anchors through the Pier 5 Skewback footing into the canyon wall. Crews on Pier 4 right erecting precast segments. The cableway crane lowering the next segment for placement is visible. Temporary scaffolding can been seen attached to Pier 3 left. Pier 2 is completed up to pier cap elevation. Behind pier 2, barely visible is the scaffolding on Pier 1 and the partially constructed Abutment 1.

High Resolution TIF (14 MB)

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Images from May 2006

Colorado River Bridge…


View of the excavation at Pier 14.
(looking down)

Harris Rebar personnel placing reinforcing steel for the Pier 14 footing (Arizona skewback). Visible along the excavation walls are rock bolts installed to provide slope stability.

High Resolution TIF (14 MB)


View of the formwork at Pier 14.
(looking down)

Harris Rebar personnel placing reinforcing steel for the Pier 14 footing (Arizona skewback).

High Resolution TIF (14 MB)


View of the excavation and formwork at Pier 14.
(looking east)

View of the excavation and formwork reinforcing steel placement for the Pier 14 footing (Arizona skewback).

High Resolution TIF (14 MB)


The precast yard
(Boulder City, Nevada).
(looking west)

Obayashi / PSM, JV nearing completion of casting precast column segments at the precast yard located near Boulder City, Nevada.

High Resolution TIF (14 MB)


Abutment 2
(looking northeast)

View of the excavation and formwork placement at Abutment 2.

High Resolution TIF (14 MB)


Abutment 2.
(looking down)

Another view of the excavation and formwork placement at Abutment 2.

High Resolution TIF (14 MB)


(overview – looking west)

High Resolution TIF (14 MB)


(zoomed in – looking west)

High Resolution TIF (14 MB)

Lower Center: Olsen Beal erecting precast segments to construct Pier 1 left.
Lower Center Background: Formwork can be seen for Abutment 1.
Lower Foreground: Temporary scaffolding hangs from the sides of Pier 2 Right and Left columns. This scaffolding is utilized during segment erection and subsequent post tensioning bar grouting operations.


Obayashi/PSM, JV Carpenters
(looking north)

Obayashi / PSM, JV carpenters constructing falsework / formwork for the cast-in-place pier caps.

High Resolution TIF (14 MB)


View of the bridge alignment
looking from Nevada to Arizona .
(looking northwest)

View of the bridge alignment looking at the Nevada approach spans. Depicted near the center left are the partially constructed Abutment 1, completed Pier 1 right column, partially completed Pier 2 right, Pier 3, and Pier 4 right columns. At the lower center of this view is the completed Pier 5 Skewback footing just below the existing US93 roadway alignment.

High Resolution TIF (14 MB)


The future bridge alignment.
(looking east)

View of the Colorado River Bridge alignment looking from Nevada towards Arizona. Near the lower left, the excavation for the future Pedestrian Plaza access trail leading to Abutment 1 zigzags up from the future parking lot area .

High Resolution TIF (14 MB)


View of the bridge alignment
looking from Arizona to Nevada. (looking east)

Aerial view of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Shown at the bottom center of this picture is the competed excavation for Pier 14 (Arizona skewback).

High Resolution TIF (14 MB)

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Images from April 2006

Colorado River Bridge…


Rock Anchors in the backwall
(looking up)

View of the installed rock anchors of the excavated backwall of Pier 14 (Arizona Skewback) taken from the footing elevation, looking up. The top of this ¼:1 excavated face is 146′ above the footing elevation.

At the right of this picture is the temporary ladder system in the process of being constructed and bolted to the excavated wall.

High Resolution TIF (14 MB)


View of the bridge alignment looking towards Abutment 1 (Nevada).
(looking west)

Lower Center: Formwork and reinforcing steel of the Pier 5 Skewback footing.
Center: Erected precast segments of Piers 1, 2, and 3 right columns in various stages of construction.
Upper Center: Formwork and reinforcing steel of partially constructed Abutment 1.
Top: View of the cableway crane systems. The South cableway (left) is completed while the North (right) is in the process of being constructed. Visible to the left of the tower crane at the lower center of the picture is the second 3❞ cable coming across the canyon.

High Resolution TIF (14 MB)


Location for Abutment 2
(looking east)

Rock excavation for Abutment 2 completed .

High Resolution TIF (14 MB)


Pier 5 Formwork
(looking southwest)

Obayashi / PSM, JV completing formwork for the Pier 5 Skewback footing.

High Resolution TIF (14 MB)


Rock anchors at Pier 14
(looking down)

View of the installed rock anchors of the excavated faces of Pier 14 (Arizona Skewback).
Right: A temporary ladder system is in the process of being constructed and bolted to the excavated wall to allow personnel access to the footing.
Lower Left: Work crews take a lunch break and sit on the excavation floor.

High Resolution TIF (14 MB)


Concrete Pump Trucks
(looking southwest)

Obayashi / PSM, JV utilizing two 58 meter pump trucks to place 2,030 cubic yards of concrete, supplied by Casino Ready Mix, for the Pier 5 Skewback footing. Placement operations were staged on the existing US-93 and began at 6:30PM, finishing at 3:30PM the following afternoon.

High Resolution TIF (14 MB)


Placing Concrete for Pier 5
(looking down)

View of the concrete placement operation for the Pier 5 Skewback footing.

High Resolution TIF (14 MB)

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Images from March 2006

Colorado River Bridge…


Preparing for the Lift
(looking south)

Olsen Beal personnel rigging the precast segment lifting jib onto a segment in preparation for lifting it over the canyon for placement.

High Resolution TIF (14 MB)


Unloading
(looking south)

View of a precast segment being unloaded off of a transport trailer in Nevada near Abutment 1.

High Resolution TIF (14 MB)


Towering Above
(looking west)

Olsen Beal working on construction of the North cableway crane in Nevada. These temporary towers rise 330′ above the future roadway elevation.

High Resolution TIF (14 MB)


The Future Pedestrian Plaza
(looking northwest)

Ladd & Associates excavating for the Pedestrian Plaza access trail leading from the future parking lot to Abutment 1.

High Resolution TIF (14 MB)


Pier 5 formwork & reinforcing steel
(looking down)

View of the Pier 5 Skewback formwork and reinforcing steel looking down from the existing US-93 roadway elevation. The Colorado River flows approximately 650 feet below the excavated ledge on which the Skewback footing is being constructed.

High Resolution TIF (14 MB)


Building the North Cableway Crane
(looking west)

Olsen Beal constructing the North cableway crane in Arizona.

High Resolution TIF (14 MB)


View of the bridge alignment looking
towards Abutment 1 (Nevada).
(looking southwest)

Lower Center: Formwork and reinforcing steel of the Pier 5 Skewback
footing in preparation for concrete placement.
Center: Olsen Beal erecting segments at Pier 2 right column.
Upper Center: Formwork and reinforcing steel of partially constructed
Abutment 1.
Top: – View of the cableway crane systems.

High Resolution TIF (14 MB)

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Images from February 2006

Colorado River Bridge…


Precast Pier
(looking southwest)

Olsen Beal utilizing the cableway crane to transport and lower a precast segment section for Pier 3 right where it will be attached to the sections below.

High Resolution TIF (14 MB)


Cranes
(looking west)

View of the roadway alignment and two cableway cranes at Abutment 2 in Arizona.

High Resolution TIF (14 MB)


Future Bridge Alignment
(looking east – towards Abutment 2; Arizona)

Lower Left: Ladd & Associates drilling holes for the tie back anchors at Abutment 1. Behind the drill rig is the Abutment stem wall under construction.
Lower Center: Visible below the tower crane are the stacked precast pier segments for Pier 2 Right.
Upper Center Right: Completed excavation of Pier 14 (Arizona Skewback). A Caterpillar 320C Trackhoe rests on the excavation floor, approximately 600 feet above the waters of the Colorado River below.

High Resolution TIF (14 MB)


Transporting precast pier sections
with the Cranes
(looking southwest)

Top right: View of the partially constructed Abutment 1.
Upper Center: View of the erected precast segments of Pier 2 right column. Visible to the right of this is the footing of Pier 2 left.
Lower Left: Olsen Beal utilizing the two cableway crane to transport and lower a precast segment section for Pier 3 right. Construction personnel stand on the footing of Pier 3 left viewing the operation.

High Resolution TIF (14 MB)


Over the River
(looking southeast)

View of an 80 foot wide preassembled reinforcing steel mat being transported across the river by the cableway crane from the Abutment 2 area to the Pier 5 Skewback where it will be placed for construction of the footing.

High Resolution TIF (14 MB)


Placing the Reinforcing Steel Mat
(looking south)

Paradise Steel personnel direct an 80 foot wide preassembled reinforcing steel mat for Pier 5 footing into position as it is being lowered by the cableway crane.

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Images from January 2006

Colorado River Bridge…


Future Bridge Alignment
(looking northwest)

View of the bridge alignment looking towards Abutment 1 (Nevada).
Lower Center: Footings of Pier 2 left and right.
Center: Stained Shotcrete constructed for stabilization of the existing rock. To the left of the Shotcrete are the footings of Pier 1 left and right.
Upper Left: The temporary towers of the cableway crane. Near the bottom of these towers, reinforcing steel projects upwards for Abutment 1.

High Resolution TIF (14 MB)


Obayashi/PSM, JV Constructing Formwork
(looking northwest)

Overall view of Obayashi / PSM, JV personnel constructing formwork for the footings of Pier 3 left and right.

Near the lower left, a shadow of a man basket appears on the canyon wall. This picture was taken from this man basket as it was suspended nearly 700 feet above the Colorado River by the Link Belt TG1900 Tower Crane erected on Pier 4’s left foundation.

High Resolution TIF (14 MB)


Constructing Formwork
(looking west)

Obayashi / PSM, JV personnel constructing formwork and reinforcing steel for the footings of Pier 3 left and right. Shown in the top left of this picture are rock anchors installed in the excavation walls.

High Resolution TIF (14 MB)


Constructing Formwork
(looking west)

Another photo of Obayashi / PSM, JV personnel constructing formwork and reinforcing steel for the footings of Pier 3 left and right. To the top left of this picture are the corrosion protection covers of the installed rock anchors in the excavation walls.

High Resolution TIF (14 MB)


Work on Piers 3 & 4
(looking down)

Top Right: The Link Belt TG1900 Tower Crane erected on the left footing foundation of Pier 4.
Lower Right:
View the completed excavation for Pier 4 right.
Lower Left: Ladd & Associates utilizing a trackhoe to remove fallen rock contained by a Rock Fall Containment system constructed near Pier 4.
Upper Left: Obayashi / PSM, JV personnel constructing formwork for the footings of Pier 3 left and right.

High Resolution TIF (14 MB)


View of the Bridge Alignment
(looking north)

View of the bridge alignment taken from downstream of Hoover Dam. Nevada approach appears to the left with Arizona to the right. Visible near the top of this picture is the twin 3❞ cables spanning the canyon for one of two cableway cranes.

High Resolution TIF (14 MB)


Excavation for Pier 5 Completed
(looking north)

View the completed excavation for Pier 5 (Nevada skewback). The excavated face shown is approximately 100′ high. Corrosion protection covers of the installed rock anchors in the excavation walls are visible in the excavated rock face.

Hoover Dam appears near the lower left of the picture.

High Resolution TIF (14 MB)


Cableway Crane Tower
(looking south)

View of the south Cableway Crane tower in Arizona depicting the pull cable slack carriers, hoist trolley, and tower stabilization cables.

High Resolution TIF (14 MB)


Pulley System
(looking east)

View of the twin 14 part pulley system of the south Cableway Crane tower in Nevada. These pulleys apply tension to the twin 3❞ highline cables that span the canyon.

High Resolution TIF (14 MB)


Skagit Hoist
(looking south)

View of the Arizona Skagit hoist used for erection of the Cableway Crane system.

High Resolution TIF (14 MB)


Future Bridge Alignment
(looking west)

View of the future bridge alignment taken from Abutment 2 (Arizona) looking towards Abutment 1 (Nevada).
Foreground: The Link Belt TG1900 Tower Crane erected on the left footing of Pier 15.
Background:
Visible are the footings and excavations for Abutment 1, Piers 1 through 5 (Nevada skewback), along with the Link Belt TG1900 Tower Crane erected on the left footing of Pier 4.

High Resolution TIF (14 MB)


Olsen Beal Personnel
(looking south)

Olsen Beal personnel winding cable onto a temporary reel during the construction of the cableway crane in Arizona.

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Images from December 2005

Colorado River Bridge…


Future Bridge Alignment
(looking east)

View of the bridge alignment from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Foreground: Obayashi / PSM, JV constructing formwork and placing reinforcing steel for Abutment 1.
Background:
Ongoing excavations for Pier 14 (Arizona skewback) and Abutment 2 along with the towers of the temporary cableway crane.

High Resolution TIF (14 MB)


Nevada Approach Pier Excavations
(looking northwest)

View of the bridge alignment taken from downstream of Hoover Dam depicting the Nevada approach pier excavations. The Link Belt TG1900 Tower Crane is erected on Pier 4 left foundation.

High Resolution TIF (14 MB)


Arizona Approach Pier Excavations
(looking northeast)

View of the bridge alignment taken from downstream of Hoover Dam depicting the Arizona approach pier excavations. The Link Belt TG1900 Tower Crane is erected on Pier 15 left foundation.

High Resolution TIF (14 MB)


Olsen Beal at work
(looking west)

Olsen Beal constructing the cableway crane in Arizona.

High Resolution TIF (14 MB)


Stringing a line
(looking south)

Upper right: View of the helicopter transporting a half-inch cable across the canyon for stringing of the cableway. Barely visible below the helicopter is a hoop in the line used to grab once it reaches the Nevada side. The second helicopter is being utilized as a spotter.

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Downstream of the Dam
(looking north)

View of the bridge alignment taken from downstream of Hoover Dam. Nevada approach appears to the left with Arizona approach to the right. Visible near the top of this picture is the twin 3" cables spanning the canyon for one of two cableway cranes.

High Resolution TIF (14 MB)

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Images from November 2005

Colorado River Bridge…


Future Bridge Alignment
(looking east)

View of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Shown are the ongoing excavations for Pier 14 (Arizona skewback) and Abutment 2. In the background of this picture, are the towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

High Resolution TIF (14 MB)


Readying the Formwork
(looking east)

Obayashi / PSM, JV personnel ready column segment formwork in preparation for concrete placement. Segments are wet cast against the next lower piece to assure a good match cast joint.

High Resolution TIF (14 MB)


Completed Precast Column Segments
(looking west)

View of the completed precast column segments stored and ready for shipment at the Obayashi / PSM, JV precast yard located near Boulder City, Nevada.

High Resolution TIF (14 MB)


Excavation work continues
(looking west)

Foreground: View of the ongoing excavations for Pier 5 (Nevada Skewbasdk) and Pier 3, and completed footings of Piers 1 and 2.

Background: The towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

High Resolution TIF (14 MB)


Excavations at the Arizona Skewback
(looking east)

Foreground: Ladd & Associates continuing excavation for Pier 14 (Arizona Skewback) and Abutment 2 and installing rock containment fencing on the canyon wall at Pier 14.

Background: The towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

High Resolution TIF (14 MB)


Fine grading activities
(looking south)

Ladd & Associates utilizing a trackhoe and rock hammer to fine grade the excavation of Pier 5 (Nevada skewback). Bottom left in this picture is the rock containment fencing installed on the canyon face.

High Resolution TIF (14 MB)


Rock Anchors and a Temporary Ladder
(looking north)

View of the installed rock anchors of the north rock excavated face of Pier 5 (Nevada Skewback). A temporary ladder system is in the process of being bolted to this wall to allow personnel access to the footing from the Nevada Hairpin area.

High Resolution TIF (14 MB)


Ladd & Associates continue grading activites
(looking down)

Ladd & Associates utilizing a trackhoe and rock hammer to fine grade the excavation of Pier 5 (Nevada skewback). Top left in this picture is the Colorado River, approximately 650-feet below the level of this excavation. Top right is a temporary rock containment structure.

High Resolution TIF (14 MB)

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Images from October 2005

Aerial Photos of the New US 93…


New Arizona Alignment
(looking west)

Aerial view of the new alignment in Arizona from Station 270+00 to 198+00 including the interim US 93 roadway.

Foreground:
View of the Arizona Interchange and associated ramps, including the Sugarloaf Mountain TIOP Bridge.

Background: Sugarloaf Mountain Bridge.

High Resolution TIF (14 MB)


US 93 New Alignment
(looking north)

Aerial view of the new alignment from Station 63+00 to 123+00.

Bottom Left: Hoover Dam Canyon Bridge.

Top Right: Hoover Dam Lower Portal Access Road Overpass (Structure H-2701), the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702), and the Hoover Dam Old US 93 Overpass (Structure H-2703).

High Resolution TIF (14 MB)


Nevada Interchange & Ramps
(looking north)

Aerial view of the Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Gold Strike Canyon Access Road.

High Resolution TIF (14 MB)


Hoover Dam Canyon Bridge
(looking west)

Aerial view of the new alignment from Station 75+00 to 26+93.

Foreground: Hoover Dam Canyon Bridge (Structure H-2700).

Background: View of the Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Gold Strike Canyon Access Road.

High Resolution TIF (14 MB)


Aerial View of 3 new Overpasses
(looking west)

Aerial view of the new alignment from Station 123+00 to 71+00 including the Hoover Dam Old US 93 Overpass (Structure H-2703), the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702), and the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).

High Resolution TIF (14 MB)


The New Alignment tying into the Old

Aerial view of the new alignment as it ties into the existing US 93 in Nevada.

High Resolution TIF (14 MB)

Colorado River Bridge…


Obayashi / PSM, JV Precast Yard
(looking east)

Aerial view of the Obayashi / PSM, JV precast yard located near Boulder City, Nevada. Four hundred-forty (440) precast segments, each weighing approximately 35 tons, will be constructed for the bridge approach and spandrel columns.

High Resolution TIF (14 MB)


Aerial View of Future Bridge Alignment

Aerial view of the new alignment looking from Arizona towards Nevada showing the location of the future Colorado River Bridge.

High Resolution TIF (14 MB)


Aerial View of Future Bridge Alignment
(looking west)

Aerial view of the future bridge alignment taken from Abutment 2 (Arizona) looking towards Abutment 1 (Nevada). Shown are the ongoing excavations for Pier 5 (Nevada skewback) and Pier 3, and completed footings of Piers 1 and 2 along with the excavation for Abutment 1 footing.

High Resolution TIF (14 MB)


Excavations for Pier 14 & Abutment 2
(looking east)

Aerial view of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Shown are the ongoing excavations for Pier 14 (Arizona Skewback) and Abutment 2. In the foreground, a crane is erecting the towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

High Resolution TIF (14 MB)


Erection of temporary cableway crane towers.
(looking southeast)

Aerial view of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Subcontractor, Olsen Beal, completing erection of the temporary cableway crane towers in Arizona. Shown at the bottom of this picture is the on-going excavation for Pier 14 (Arizona Skewback) being performed by Ladd & Associates.

High Resolution TIF (14 MB)


Nevada Approach…Completed!


Lower Portal Access Road Overpass
(looking north)

View of the completed Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).

High Resolution TIF (14 MB)


BOR Warehouse Old US 93 Overpass
(looking northwest)

View of the completed Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702).

High Resolution TIF (14 MB)


Interchange Bridge
(looking north)

View of the completed Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)


Canyon Bridge
(looking north)

View of the completed Hoover Dam Canyon Bridge (Structure H-2700) from Gold Strike Canyon.

High Resolution TIF (14 MB)


Nevada Interchange & Ramps
(looking west)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)


Old US 93 Overpass
(looking northeast)

View of the completed Hoover Dam Old US 93 Overpass (Structure H-2703).

High Resolution TIF (14 MB)

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Images from September 2005

Colorado River Bridge…


Installing rock anchors. The photo one row below shows a more global picture of where this work is actually being done. Two rows below, is a "bird’s eye" view of this work "area" (or ledge!).
(looking southeast)

Ladd & Associates installing rock anchors at Pier 14 with the aid of a Caterpillar 320C trackhoe.

High Resolution TIF (14 MB)


Excavation for Abutment 2
(looking north)

View of the rock excavation for Abutment 2 footing (Arizona) including the rock containment at the excavation face. Inverted orange cones indicate drilled holes in preparation for blasting of the next lift.

High Resolution TIF (14 MB)


Excavation work – look closely, you can see the work area for the men and equipment shown in the first photo, at the row above.
(looking east)

View of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Shown are the ongoing excavations for Pier 14 (Arizona Skewback) and Abutment 2. In the background of this picture, a crane is erecting the towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

High Resolution TIF (14 MB)


Preparing to lift a segment of the crane tower
(looking west)

Subcontractor, Olsen Beal, preparing for a lift of one segment of the North temporary cableway crane tower. At completion, each tower will rise 352-feet above the roadway elevation and will carry six 3-inch diameter cables (3 each) 2,600 feet across the canyon.

High Resolution TIF (14 MB)


Don’t look down!

Aerial view of Ladd & Associates installing rock anchors for the backwall on Pier 14 (Arizona Skewback) looking down from a man basket suspended above. Bottom right corner of this picture is the Colorado River…approximately 650-feet below the level of this excavation.

High Resolution TIF (14 MB)


Future bridge alignment
(looking west)

View of the future bridge alignment taken from Abutment 2 (Arizona) looking towards Abutment 1(Nevada). Shown are the on-going excavations for Pier 5 (Nevada Skewback) and Pier 3; and completed footings of Piers 1 and 2. At the lower left of the picture, a crane located on Pier 15 lowers personnel to the Pier 14 excavation (Arizona Skewback).

High Resolution TIF (14 MB)

Nevada Approach…


Canyon Bridge
(looking west)

Foreground: Edward Kraemer & Sons putting final finishes on the barrier railing of the Hoover Dam Canyon Bridge (Structure H-2700).

Background: View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)


US 93 – new alignment
(looking west)

View of the completed US 93 alignment from Station 61+00 to 40+00 including the Hoover Dam Interchange Bridge (Structure H-2699), Ramp D, MSE Wall 1, and the Gold Strike Canyon Access Road.

High Resolution TIF (14 MB)


In with the new, out with the old.
(looking east)

View of the completed US 93 alignment from Station 89+00 to 105+00 including the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701) and the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702).

High Resolution TIF (14 MB)


Grading and compacting
(looking east)

KLB performing fine grading and compaction of embankment material for Ramp B, D and the Gold Strike Canyon Access Road. The Hoover Dam Canyon Bridge (Structure H-2700) appears in the upper right of this photo.

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Images from August 2005

Colorado River Bridge…


Building bridge segments
(looking west)

Obayashi / PSM, JV constructing precast segments for the Pier columns at the precast yard located near Boulder City, Nevada.

High Resolution TIF (14 MB)


Stacking column segments
(looking east)

Obayashi / PSM, JV stacking precast column segments to verify casting and alignment at the precast yard.

High Resolution TIF (14 MB)


Rock containment work
(looking north)

Ladd & Associates working from a man basket to construct rock containment at Abutment 2.

High Resolution TIF (14 MB)


Future bridge alignment
(looking west)

View of the future bridge alignment taken near Pier 5 (Nevada Skewback) looking towards Abutment 1 (Nevada). Shown is the formwork for Pier 1 right, Pier 2 left/right, and pioneered access road into Pier 3.

High Resolution TIF (14 MB)

Nevada Approach…


New US 93 Alignment
(looking west)

View of the new US 93 alignment from Station 98+00 to 85+00 looking across the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701) bridge.

High Resolution TIF (14 MB)


Nevada Interchange & ramps
(looking northwest)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Gold Strike Canyon Access Road.

High Resolution TIF (14 MB)


Old US 93 Overpass
(looking northeast)

View of the Hoover Dam Old US 93 Overpass (Structure H-2703) from the existing US 93.

High Resolution TIF (14 MB)


Loading & Hauling Excavated Material
(looking southwest)

KLB Construction loading and hauling excavated material from the US 93 alignment near the Hoover Dam Old US 93 Overpass (Structure H-2703).

High Resolution TIF (14 MB)

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Images from July 2005

Colorado River Bridge…


Future bridge alignment
(looking west)

View of the future bridge alignment taken from Abutment 2 (Arizona) looking towards Abutment 1 (Nevada). Shown is Ladd & Associates drilling for blasting operations at Pier 5, the rock containment structure near Pier 4 right, and constructed formwork for Piers 1 and 2 left footings.

High Resolution TIF (14 MB)


Excavation with Link Belt TG1900 tower crane
(looking west)

Ladd & Associates removing blasted rock from the Pier 14 (Arizona Skewback) excavation utilizing an 8 cubic yard bucket and the Link Belt TG1900 tower crane erected on Pier 15 left footing.

High Resolution TIF (14 MB)


Formwork for temporary footings
(looking west)

Obayashi / PSM, JV constructing formwork for the temporary cableway crane tower footings located in the Arizona alignment. Each footing will utilize 200 cubic yards of concrete to construct.

High Resolution TIF (14 MB)


High Resolution TIF (14 MB)


Nevada Skewback excavation
(looking east)

Foreground: Ladd & Associates preparing to excavate blasted rock from the Pier 5 (Nevada Skewback) excavation.

Background: View of Arizona side of the canyon showing Pier 14 (Arizona Skewback), Pier 15 and Abutment 2 location along with the Link Belt TG1900 tower crane erected on Pier 15 left footing.

High Resolution TIF (14 MB)


Link Belt TG1900 tower crane on Pier 15
(looking east)

View of the future bridge alignment taken from Pier 5 (Nevada Skewback) looking towards Abutment 2 (Arizona). Shown is the Link Belt TG1900 tower crane located on Pier 15 left footing. Ladd & Associates utilizing a trackhoe to pioneer access to the top of Pier 15 right excavation.

High Resolution TIF (14 MB)

Nevada Approach…


New US 93 Alignment
(looking northeast)

View of the new US 93 alignment from Station 55+00 to 75+00 including the Hoover Dam Canyon Bridge (Structure H-2700). A small portion of the Gold Strike Canyon Access Road appears in the lower right of the photograph.

High Resolution TIF (14 MB)


Grading and Compacting on new US 93
(looking east)

Foreground: KLB Construction fine grading and compacting the final lift on the constructed roadway embankment between Station 55+00 and 65+50.

Background: Edward Kraemer & Sons constructing barrier railing on the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF (14 MB)


Nevada Interchange
(looking west)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Gold Strike Canyon Access Road.

High Resolution TIF (14 MB)


Old US 93 Overpass
(looking northeast)

View of the Hoover Dam Old US 93 Overpass (Structure H-2703) from the existing US 93.

High Resolution TIF (14 MB)


New US 93 and Canyon Bridge
(looking east)

View of the new US 93 alignment from Station 55+00 to 70+00 including the Hoover Dam Canyon Bridge (Structure H-2700). KLB Construction fine grading and compacting the final lift of the constructed roadway embankment.

High Resolution TIF (14 MB)


Nevada Interchange
(looking south)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)

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Images from June 2005

Colorado River Bridge…


Ladd & Associates at work
(looking west)

Ladd & Associates, assembling the lattice boom section of a Link Belt TG1900 Tower Crane to be erected on the Pier 15 left footing.

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Assembling a Tower Crane
(looking east)

Ladd & Associates, assembling a Link Belt TG1900 Tower Crane on Pier 15 left footing. This crane will be utilized to access and excavate Pier 14 (Arizona Skewback) and Pier 15 right.

High Resolution TIF (14 MB)


Removing Temporary Access Road
(looking west)

Ladd & Associates removing temporary access road into Pier 2 area from Abutment 1.

High Resolution TIF (14 MB)


View of the Future Bridge Alignment
(looking east)

View of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Pictured are the two Link Belt TG1900 tower cranes, one on Pier 4 left footing and the other on Pier 15 left footing.

High Resolution TIF (14 MB)


Obayashi / PSM, JV at work on Pier 1
(looking northeast)

Obayashi / PSM, JV constructing formwork and setting grade elevations for the Pier 1 left footing.

High Resolution TIF (14 MB)


Looking from Pier 5 to Pier 1
(looking southwest)

Aerial view of the new bridge alignment looking from Pier 5 (lower left) to Pier 1 (mid right). The Nevada Hairpin of the existing US 93 appears at the bottom of the photograph as it turns near the Link Belt TG1900 tower crane erected on the Pier 4 left.

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Nevada Approach


Edward Kraemer & Sons at work
(looking east)

Edward Kraemer & Sons placing concrete for the deck section of the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF (14 MB)


KLB Construction installing RCP pipe
(looking west)

KLB Construction installing RCP storm drainage pipe and drop inlets along the centerline of the new US 93 alignment from Station 61+55 to 65+50.

High Resolution TIF (14 MB)


View of Nevada Interchange
(looking east)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)


New US 93 Alignment
(looking east)

Foreground: KLB Construction loading blasted embankment material onto haul trucks from the new roadway alignment near Station 122+00.

Background: Yenter Companies drilling in preparation for blasting operations to excavate the roadway alignment near Station 123+50.

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New US 93 alignment
(looking west)

View of the new US 93 roadway alignment from Station 75+00 to 109+00, including the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701) and the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702).

High Resolution TIF (14 MB)


New US 93 Alignment from Station 75+00 to 119+00
(looking southwest)

Top to Bottom: Hoover Dam Lower Portal Access Road Overpass (Structure H-2701) and the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702), Hoover Dam Old US 93 Overpass (Structure H-2703) and the Nevada Security Checkpoint location.

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Images from May 2005

Colorado River Bridge…


Ladd & Associates at work
(looking southwest)

Top Right: Ladd & Associates placing Shotcrete for the Special Rock Feature reinforcement near Pier 1.

Middle Left: Ladd & Associates drilling in preparation for pioneering blasting to gain access to the Pier 2 area from Abutment 1.

High Resolution TIF (14 MB)


Removing formwork from Pier 4
(looking west)

Obayashi / PSM, JV removing formwork from the recently placed concrete for Pier 4 Left footing. The crane is setting on the area to be excavated for Pier 5 near the Nevada Hairpin.

High Resolution TIF (14 MB)


Arizona Side of the Canyon
(looking north)

View of the rock containment structures (fencing) near Abutment 2 on the Arizona side of the canyon.

High Resolution TIF (14 MB)


Rock Containment Structures
(looking northwest)

Ladd & Associates constructing rock containment structures near Pier 15.

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Arizona Side of the Canyon
(looking east)

Top: View of the Arizona side of the canyon showing Abutment 2 and pioneered access road to Pier 15.

Bottom: Obayashi / PSM, JV removing formwork from the recently placed concrete for Pier 4 Left footing.

High Resolution TIF (14 MB)


Ladd & Associates placing Shotcrete
(looking north)

Ladd & Associates placing Shotcrete for the Special Rock Feature reinforcement near Pier 1on the Nevada side of the canyon.

High Resolution TIF (14 MB)

Nevada Approach


New US 93 Alignment
(looking south)

View of the new US 93 alignment from Stations 26+93 to 75+00 including the Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF (14 MB)


Existing US 93 Alignment
(looking northeast)

View of traffic on the existing US 93 as it passes through the falsework of the newly constructed Hoover Dam Old US 93 Overpass (Structure H-2703).

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Adjusting the Paving Machine
(looking west)

Edward Kraemer & Sons adjusting the Bidwell Paving Machine in preparation for concrete placement for the deck section of the Hoover Dam Canyon Bridge (Structure H-2700).

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Prepping for falsework removal
(looking southwest)

Foreground: Edward Kraemer & Sons setting up winches in preparation of falsework removal on the newly constructed Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).

High Resolution TIF (14 MB)


Lost Deck Formwork
(looking west)

View of the completed lost deck formwork on the Hoover Dam Old US 93 Overpass (Structure H-2703).

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New US 93 Alignment
(looking east)

View of the new US 93 alignment from Stations 56+00 to 70+00 including the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF (14 MB)

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Images from April 2005

Breaking Ground for the Colorado River Bridge…


Nevada Side of the Canyon
(looking west)

In this view of the Nevada side of the canyon, Ladd & Associates is shown pioneering access to Abutment 1, Pier 1 and Pier 2.

Look closely at the bottom of the picture – the 3 white dashed lines on the canyon wall indicate where the skewback foundations are to be constructed to attach the bridge arch to the canyon wall.

High Resolution TIF (14 MB)


Rock Containment Structures
(looking southwest)

View of the rock containment structures (fencing) near Pier 1 and 2 on the Nevada side of the canyon, prior to commencement of blasting operations.

High Resolution TIF (14 MB)


Arizona Side of the Canyon
(looking east)

Ladd & Associates pioneering access to Abutment 2 and Pier 15 from the Arizona side of the canyon. Constructed rock containment structures appear near the bottom right of the picture.

High Resolution TIF (14 MB)


Pioneering Access to Abutment and Piers
(looking west)

Ladd & Associates pioneering access to Abutment 1, Pier 1 and Pier 2 from the Nevada side of the canyon. Constructed rock containment structures appear near the bottom the the picture.

High Resolution TIF (14 MB)


New US 93
(looking south)

View of the new US 93 alignment from station 197+65 to 206+00 including the Sugarloaf Mountain rock cut and the staging area for the earthworks subcontractor, Ladd & Associates.

High Resolution TIF (14 MB)


New US 93 Alignment
(looking south)

View of new US 93 alignment from station 170+00 to 177+00 including the staging area for the earthworks subcontractor, Ladd & Associates.

High Resolution TIF (14 MB)

The Nevada Approach is nearly 90% complete!


Lower Portal Access Road Overpass
(looking southwest)

Edward Kraemer & Sons removing curing blankets from the recently constructed deck of the Hoover Dam Lower Portal Access Road Overpass
(Structure H-2701).

High Resolution TIF (14 MB)


Old US 93 Overpass
(looking west)

View of Edward Kraemer & Sons constructing formwork for the girder sections at the Hoover Dam Old US 93 Overpass (Structure H-2703).

High Resolution TIF (14 MB)


Canyon Bridge
(looking east)

Edward Kraemer & Sons completing placement of stay-in-place formwork and Paradise Rebar placing reinforcing steel for the deck of the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF (14 MB)


New US 93 Alignment
(looking southwest)

View of the new US 93 alignment from stations 76+00 to 110+00 including the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701) and the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702).

High Resolution TIF (14 MB)


Nevada Interchange and New US 93 Alignment
(looking west)

View of the new US 93 alignment from stations 26+93 to 75+00 including the Nevada Interchange and associated ramps, also including the Hoover Dam Interchange Bridge (Structure H-2699) and the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF (14 MB)


Nevada Interchange and Ramps
(looking west)

View of the Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)

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Images from March 2005

Interchange and Overpass – Bridges on the Nevada side take shape…


Nevada Interchange
(looking southeast)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)


Hoover Dam Interchange Bridge
(looking north)

View of completed Hoover Dam Interchange Bridge (Structure H-2699) looking from the Gold Strike Canyon Access Road.

High Resolution TIF (14 MB)


Hoover Dam Canyon Bridge Pier
(looking northeast)

Edward Kraemer & Sons torque bolts at the connections of the structural steel girders for the Hoover Dam Canyon Bridge (Structure H-2700) from Pier 1 to Pier 2.

High Resolution TIF (14 MB)


Steel Girders of the Canyon Bridge
(looking west)

View of the completed structural steel girders for the Hoover Dam Canyon Bridge (Structure H-2700) looking from Abutment 2 towards Abutment 1.

High Resolution TIF (14 MB)


Post Tensioning Ductwork
(looking northwest)

Paradise Rebar placing post tensioning ductwork for the girder sections at the Hoover Dam Old US93 Overpass (Structure H-2703).

High Resolution TIF (14 MB)


Formwork on Lower Portal Access Road Overpass
(looking southwest)

Foreground: Edward Kraemer & Sons constructing lost deck formwork for the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).

Background: View of placed embankment fill from US93 station 85+00 to 94+76.

High Resolution TIF (14 MB)

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Images from February 2005

Nevada Approach: Setting the Girders…


Nevada Interchange
(looking west)

View of Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699).

High Resolution TIF (14 MB)


Hoover Dam Canyon Bridge
(looking northeast)

Edward Kraemer & Sons placing the structural steel girders for the Hoover Dam Canyon Bridge (Structure H-2700) from Pier 1 to Pier 2.

High Resolution TIF (14 MB)


Barrier Fencing
(looking north)

LS Fence constructing wildlife and tortoise barrier fencing.

High Resolution TIF (14 MB)


Hoover Dam Canyon Bridge
(looking north)

Edward Kraemer & Sons placing the structural steel girders for the Hoover Dam Canyon Bridge (Structure H-2700) from Abutment 1 to Pier 1.

High Resolution TIF (14 MB)


Canyon Bridge
(looking northeast)

View of the partially completed substructure of the Hoover Dam Canyon Bridge (Structure H-2700) and roadway alignment from Station 60+00 to 80+00.

High Resolution TIF (14 MB)


Mechanically Stabilized Earth Wall 2
(looking northwest)

View of completed Mechanically Stabilized Earth Wall 2 along the right side of Ramp D from Station 102+44 to Station 111+74 prior to application of the weathering agent (rock staining).

High Resolution TIF (14 MB)


Lower Portal Access Road Overpass
(looking southwest)

Foreground: Edward Kraemer & Sons constructing formwork for the girders of the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).
Background: KLB Construction placing embankment fill from US 93 Station 85+00 to 94+76.

High Resolution TIF (14 MB)

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Images from January 2005

Nevada Approach: Building into a new year


Canyon Bridge
(looking northwest)

Foreground: Edward Kraemer & Sons constructing
formwork for Abutment 2 of the Hoover Dam
Canyon Bridge (Structure H-2700).
Center: View of Pier 2 in construction and the completed Pier 1 of the Hoover Dam Canyon Bridge.
Background: View of the formwork placement for Abutment 1 of the Hoover Dam Canyon Bridge.

High Resolution TIF (14 MB)


Pier 2 – Hoover Dam Canyon Bridge
(looking northwest)

Paradise Rebar placing reinforcing steel for construction of Pier 2 (right) on the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF(14 MB)


Old US 93 Overpass
(looking west)

Center right: View of the completed Abutment 1 Bearing Seat at the Hoover Dam Old US 93 Overpass (Structure H-2703).
Center left: KLB Construction placing fill material to construct the US 93 alignment from Stations 110+00 to 115+00.

High Resolution TIF (14 MB)


Hoover Dam Canyon Bridge
(looking north)

Center left: View of the US 93 alignment from Station 60+00 to 65+00.
Center right: Edward Kraemer & Sons constructing
the Hoover Dam Canyon Bridge (Structure H-2700).

High Resolution TIF(14 MB)


New US 93 Alignment
(looking southwest)

View of the completed US 93 alignment from Station 177+00 to Station 170+00.

High Resolution TIF (14 MB)


Lower Portal Access Road Overpass
(looking southwest)

Foreground: View of reinforcing steel, formwork, and post tensioning duct placement for construction of the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).
Background: View of the embankment fill for construction of the US 93 alignment from Station 71+00 to Station 95+00.

High Resolution TIF(14 MB)

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Additional Photos/Images of the Hoover Dam Bypass Project

If you would like to see renderings of what we expect the final project to look like, please see our other Photo Gallery.

If you would like to see construction photos of the Arizona Approach (Mid-2003 to November 2004), please use this link: Arizona Approach Photos

If you would like to see earlier photos of the Nevada Approach (construction prior to January 2005), please use this link: Nevada Approach Photos

To view real-time images of construction on the Colorado River bridge, please see our Hoover Dam Bypass Webcam.

Back to Construction Activities