Visitors are attending the museum inside Hoover Dam, also known as Boulder Dam, standing in the Black Canyon of the Colorado River, forming Lake Mead, on the border between Nevada and Arizona, USA. Constructed between 1931 and 1936 by President Franklin D. Roosevelt, its construction was the result of a massive effort involving thousands of workers. Lake Mead is 180 km long, and when filled to capacity can reach 28 million acre-feet of water. However, the lake has not reached this capacity in more than a decade, due to increasing droughts.
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