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Buy the "Great Projects" videos and companion book at ShopPBS. |
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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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  How engineers contained and controlled the Colorado and Mississippi rivers. Thomas Edison lights up New York City; Sam Insull brings power to Chicago; and TVA electrifies rural America Constructing the George Washington Bridge Putting a major highway under Boston  |
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