Lyons Dam

Lyons Dam (National ID # CA00387) 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 ft and a length of 535 ft 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.

The reservoir it creates, Lyons Reservoir, has a normal water surface of 184 acre, and a maximum capacity of 6400 acre.ft. Recreation includes fishing. The site is surrounded by the Stanislaus National Forest. In 2012, about 625 acre of adjacent land known as the Rushing Meadows parcel was transferred from PG&E's ownership to the National Forest Service, as part of the utility's bankruptcy settlement.