Union Valley Reservoir
General data
- Name: Union Valley Reservoir
- Water system: Sacramento River
- Water type: Artificial lake
- Progression: Silver Creek (American River tributary) -> South Fork American River -> American River (Sacramento River tributary) -> Sacramento River -> Suisun Bay -> Carquinez Strait -> San Pablo Bay -> San Francisco Bay -> Golden Gate strait -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Union Valley Reservoir is a reservoir in eastern El Dorado County, California, about 20 miles (32 km) northeast of Placerville. The 277,000 acre-feet (342,000,000 m3) lake is in Eldorado National Forest in the Sierra Nevada at an elevation of 4,870 feet (1,480 m).
It was formed in 1963 (62 years ago) by the 453-foot (138 m) high earth and rockfill Union Valley Dam on Silver Creek, which is a tributary of the American River. The reservoir is part of the Upper American River Project of the Sacramento Municipal Utility District, a public electric utility, which operates the dam and many other dams in the area. Recreation such as boating, fishing and camping is available there.