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O'Shaughnessy Dam is a 430-foot high concrete arch-gravity dam in Tuolumne County, California, in the United States. It impounds the Tuolumne River, forming the Hetch Hetchy Reservoir at the lower end of Hetch Hetchy Valley in Yosemite National Park, about 160 miles east of San Francisco.
https://en.wikipedia.org/wiki/O'Shaughnessy_Dam_(California)