Hoover Dam was built by Major Powell's nephew (he explored the Grand Canyon). His name was Arthur Powell Davis and the dam was built in 1936. It holds back the Colorado River and this forms Lake Mead which the largest artificial lake in the world. While the dam was being built, Arthur Powell Davis passed away and never saw it finished. The dam is 660 feet thick at it's base and the weight of it is heavier than the Great Pyramid in Egypt. The site is Black Canyon on the border of Arizona and Nevada.
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