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Tour the Projects: See the building of: The Hoover Dam, Mississippi Levees, The First Utility, Bridges of NYC, Boston's Big Dig
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Tour the ProjectsA Tale of Two Rivers


A Keystone in a System of Dams and Canals

A Keystone in a System of Dams and Canals

On December 5, 1943, the three-millionth ton of concrete capped off the dam, enough to pave a highway from San Francisco to New York City. Over the next two years, water pooled up behind the wall, creating Lake Mead, the largest reservoir in the United States. The Hoover Dam would become the keystone in a system of dams and canals that prevents floods. It irrigates southern California and Arizona, including the Imperial Valley; gives clear water to metropolitan Los Angeles and San Diego, and generates electrical power for Las Vegas and most of southern California.

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Great Projects: The Building of America



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