. (top/west) The reservoir is located in the foothills of the
Sierra Nevada. Communities located nearby are
Moccasin and
La Grange. It is the
sixth-largest reservoir in California. Also referenced as
Don Pedro Lake when the name is qualified, the first projects in 1923 are generally referred to as the Old
Don Pedro Dam and reservoir, and the 1971 upgrades are the
New Don Pedro Dam and reservoir. Don Pedro Reservoir takes its name from Don Pedros Bar.
Pierre ("Don Pedro") Sainsevain was one of the first prospectors after the discovery of gold in 1848 that began the
California Gold Rush. When full, the reservoir's shoreline is approximately . The reservoir submerges some of
Tuolumne River bed, and has a surface area of about . The stored here comes from a
watershed of over , and is used by the
Modesto Irrigation District (MID) and the Turlock Irrigation District (TID) for the
irrigation of several hundred square miles of
San Joaquin Valley farm land. Some of the water is treated by the MID and used as drinking water in
Modesto. The two irrigation districts and the
BLM control the land above the high lake level. ==Recreation==