Construction work for the Hoover Dam begins after the appropriations were approved; it was built during the Great Depression, between 1930 and 1937. The dam was dedicated in 1935, it started providing electricity to Los Angeles on October 9 1936 and had all the hydroelectric generators online in 1937.
The Hoover Dam was built for a cost of $49 million (approximately $760 million adjusted for inflation). The power plant and generators cost an additional $71 million. The sale of electrical power generated by the dam paid back its construction cost, with interest, by 1987. More
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