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Hoover Dam Bridge

Mike O'Callaghan–Pat Tillman Memorial Bridge is an arch bridge in the United States that spans the Colorado River between the states of Arizona and Nevada. The bridge crosses the Colorado River approximately 1,500 feet downstream of Hoover Dam. Construction of the bridge approaches began in 2003, and construction of the bridge itself began in February 2005. The bridge was completed in 2010 and the entire bypass route opened to vehicle traffic on October 19, 2010.
The bridge was concrete-steel composite arch bridge. At 840 feet above the Colorado River, it is one of the highest bridge in the United States. The Hoover Dam bridge project was completed at a cost of $114 million.