Hetch Hetchy Valley

Hetch Hetchy Valley [r]: A glacial valley in Yosemite National Park in California flooded in the 1920s by O'Shaughnessy Dam on the Tuolumne River, forming the Hetch Hetchy Reservoir, part of the water supply for the city of San Francisco, California, California (U.S. state). Damming the Tuolumne and flooding the valley was protested by John Muir and the Sierra Club [e]

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