Daily Overviewのインスタグラム(dailyoverview) - 2月17日 04時46分

Hoover Dam is a 726-foot high, 1,244-foot wide concrete arch-gravity dam located on the Colorado River at the border of Arizona and Nevada. Constructed between 1931 and 1936 during the Great Depression, a workforce of approximately 20,000 poured a total of 4.36 million cubic yards of concrete to complete the structure. That is enough concrete to pave a two-lane highway from San Francisco to New York City.

Source imagery: @digitalglobe

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