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			November 26, 2009

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You are here : AllRefer.com > Reference > Encyclopedia > U.S. Physical Geography > Hetch Hetchy Valley
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Hetch Hetchy Valley, U.S. Physical Geography

Related Category: U.S. Physical Geography

Hetch Hetchy Valley, in Yosemite National Park, central Calif., on the Tuolumne River. It once rivaled Yosemite Valley in beauty and grandeur. O'Shaughnessy Dam (completed 1923; enl. 1938) turned the valley into a lake c.9 mi (14 km) long, which is used for generating power and for supplying water to San Francisco by an aqueduct 156 mi (251 km) long.

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