' Owner: U.S. Federal Highway Administration ' General Contractor: Obayashi/PSM JV ' Subsurface Conditions: Rock ' Technique(s) Utilized: Anchors and Micropiles PROJECT CASE STUDY he Hoover Dam Bypass, was the first concrete- steel composite arch bridge built in the United States, and includes the longest concrete arch in the Western Hemisphere. Opened in October 2010, the bridge provides a crossing of the Colorado River for U.S. R

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