The Hoover Dam Bypass and
Mike O’Callaghan-Pat Tillman Memorial Bridge

When opened to traffic the week of October 18, 2010, the Mike O’Callaghan-Pat Tillman Memorial Bridge – and the rest of the 3.5 mile-long Hoover Dam Bypass – will serve thousands of drivers on U.S. 93 each day.  By 2027, it is estimated that the route will serve 26,000 vehicles daily.


The Bypass will improve safety and relieve major traffic congestion along U.S. 93 by providing a more direct, four-lane highway route that will eliminate sharp turns, narrow lanes, inadequate shoulders, poor sight distance and low travel speeds. The bridge will offer pedestrians a safe opportunity to view the Hoover Dam from a unique vantage point that didn’t exist before its construction.

In addition, commercial trucks – which had been detoured 23 miles around the Hoover Dam since Sept. 11, 2001 – will be able to use the shorter, more direct route the Bypass makes possible.

Prior to the opening of the Bypass, the estimated travel time to cross the existing 6.3 miles from northeast to southwest of the dam has exceeded 30 minutes at peak travel times.  The Bypass is expected to significantly cut travel time. 


  • Federal Funds                                                             $100 million

(including National Corridor Planning and Development Funds, Public Lands Discretionary Funds, Federal Highway Administration High Priority Project Funds, 2003 Consolidated Appropriations Resolution Funds, and general USDOT Appropriations Funds)

  • Bond Funds (from Arizona and Nevada)                    $100 million

(approximately $96.3 million has been repaid)

  • Arizona                                                                         $20 million
  • Nevada                                                                         $20 million


  • Construction of the Bypass began in February 2003. Construction of the bridge began in January 2005.
  • The bridge is 1,900 feet long and its twin concrete arches – at 1,060 feet – are the longest in the western hemisphere.  At 890 feet above the river below, it is the second tallest in the United States, second only to the Royal Gorge Bridge in Colorado.
  • The bridge’s roadway deck is 890 feet above the Colorado River and 277 feet above the Hoover Dam.
  • Construction of the bridge required the excavation of more than 3.6 million cubic yards of rock and embankment.
  • The bridge used 30,000 cubic yards of concrete with the entire Bypass using 63,000 cubic yards of concrete overall.
  • The bridge contains about 16 million pounds of steel including more than two million feet of cable stay strand.  
  • Over the eight years of construction, workers endured 374 days of triple-digit temperatures (the highest being 117 degrees) with gusts of wind topping 35 mph about 80 times each year.

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