Beardsley Dam (National ID # CA00263) is a dam in Tuolumne County, California.
The earthen dam was completed in 1957 with a height of 284 feet (87 m), and a length of 1,000 feet (300 m) at its crest. It impounds the Middle Fork of the Stanislaus River for hydroelectric power and irrigation water storage, part of the Stanislaus River Tri-Dam project cooperatively owned by the Oakdale Irrigation District and South San Joaquin Irrigation District. The site is surrounded by the Stanislaus National Forest.
The reservoir it creates, Beardsley Lake, was a water surface of 1.1 square miles, a maximum capacity of 97,800 acre feet (120,600,000 m3), and a normal capacity of 97,500 acre feet (120,300,000 m3). Recreation includes camping, fishing, and boating.