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Hoover Dam By-pass Bridge

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Hoover Dam By-pass Bridge - Page Text Content

BC: Photos by Eileene Smith 2007 to 2012

FC: Mike O'Callaghan-Pat Tillman Memorial Bridge 2011 Hoover Dam Bypass Bridge

1: The Birth of a Modern Marvel | The planning for the new concrete-arch bridge started after the 9/11 attack when commercial trucks were banned from the Dam for security reasons. The bridge sits a quarter-mile down-stream from the Hoover Dam, on the Colorado River. The 10 year construction odyssey took more than three years in planning. Ground was broken in January 2005. When a storm collapsed one of the towers that carried an elaborate cable system, functioning like a heavy-duty dumbwaiter, progress was set back 16 months. In August of 2009 the arch was completed and dedication was held in October of 2010. This was in conjunction with the 75th anniversary of the dedication of the Hoover Dam by President Franklin D. Roosevelt. Like the Dam- which was the world's tallest in its day- this new landmark boasts superlatives of its own. It is the largest concrete-arch bridge in the Western Hemisphere, sitting on the highest precast segmented columns in the world. This $240 million project was completed by 400 engineers and over 1200 trade and craft workers. Dave Zanetell was the project manager.

2: June 2007 | Workers began excavating 25,000 cubic yards of rock and building 300-foot-high reinforced concrete columns that would support the first 840 of roadway on land.

4: ARIZONA NEVADA | Early 2008

6: Building the Arch, Step by Perilous Step Construction of the 1060-foot-long arch started in January 2008 and took 19 months of dangerous, painstaking high-wire work.

7: Two 140-foot metal towers were erected on either side of the canyon, strung with an elaborate system of steel cables.

8: Each half of the span was built by casting it piece by piece in mid-air-106 sections in all. Workers adjusted the angle and position of the growing arch by pulling on steel cables | Winter 2008 -2009

10: To create a perfect curve, the two sides had to meet within one inch of each other. | Summer 2009

12: The 3/8"gap between the halves was joined by a block of reinforced concrete. | Fall 2009

14: Early 2010 | The final heavy construction phase was the 1900 foot long, 88 foot wide bridge and connecting it with the 840 foot roadway on land.

16: May 2010

18: Fall 2010 | The new bridge stands 900 feet in the air giving a panorama view of the Dam, lake, river and surrounding mountains. Dedication and grand opening was in October of 2010.

20: New Road to the New Bridge

21: We were there in the Spring of 2009 | Cosmo Corvaglia | Alice (Smith) Corvaglia | Charles and Eileene (Bacon) Smith

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  • By: Eileene N.
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  • Title: Hoover Dam By-pass Bridge
  • As the bridge was build
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  • Started: almost 7 years ago
  • Updated: about 6 years ago