Lyons Dam is a dam in Tuolumne County, California. The concrete single-arch dam was constructed in 1930 by the Pacific Gas and Electric Company, with a height of 132 feet and a length of 535 feet at its crest. It impounds the South Fork Stanislaus River for the municipal water supply of the Twain Harte, California area. Owned and operated by Pacific …Lyons Dam is a dam in Tuolumne County, California. The concrete single-arch dam was constructed in 1930 by the Pacific Gas and Electric Company, with a height of 132 feet and a length of 535 feet at its crest. It impounds the South Fork Stanislaus River for the municipal water supply of the Twain Harte, California area. Owned and operated by Pacific Gas and Electric Company, the largest private owner of hydroelectric facilities in the United States, it is one of the company's 174 dams.
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