The Hoover Dam, circa 1935, is one of the most important engineering marvels coming out of the depression. The Art Deco styling of the bridge, the engineering, the construction, and the number of people employed, made this one of the largest successes of that era. The bypass bridge, named for Pat Tillman and Sen Mike O'Callaghan was added after the effects of September 11, 2001, is an additional engineering marvel; standing over 900' above the Colorado River, and is the largest concrete arch bridge in North America.
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