Operations At The Hoover Dam [Getty Images]

Lake Mead stands in Boulder City, Nevada, U.S., on Monday, March 24, 2014. Hoover Dam, operated by the U.S. Bureau of Reclamation, is a concrete arch-gravity dam in the Black Canyon of the Colorado River that impounds Lake Mead, the largest reservoir in the U.S. by volume. Photographer: Sam Hodgson/Bloomberg via Getty Images

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