Hoover Dam, formerly called Boulder Dam, dam in Black Canyon on the Colorado River, at the Arizona-Nevada border, U.S. Constructed between 1930 and 1936, it is the highest concrete arch-gravity dam in the United States.
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The St.Francis Dam, created by the Los Angeles County Water and Power company as part of the California aqueduct system, collapsed at 11:58 pm on March 12, 1928, making it the was the worst manmade disaster in California history.