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April 19, 2014

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Visitors to Hoover Dam and Lake Mead walk near canyon walls ringed with white mineral deposits where water once lapped indicating the drop in water levels, near Boulder City, Nev., Dec. 18, 2013.

New York Times / Jim Wilson

Visitors to Hoover Dam and Lake Mead walk near canyon walls ringed with white mineral deposits where water once lapped indicating the drop in water levels, near Boulder City, Nev., Dec. 18, 2013.