Lake Del Valle

Lake Del Valle is a storage reservoir located 10 miles (16 km) southeast of Livermore, in Alameda County, California.

The lake is on Arroyo Valle (Spanish for "creek of the valley") in the Diablo Range, and is formed by Del Valle Dam, completed in 1968 (57 years ago) (1968).

The lake serves in part as off-stream storage for the South Bay Aqueduct.

The Hetch Hetchy Aqueduct passes below the lake, but does not connect to it.

The California Office of Environmental Health Hazard Assessment issued a fishing advisory regarding the mercury levels of fish caught from the body of water.

Aerial view of Lake Del Valle and Del Valle Regional Park, with Livermore and Mount Diablo in the distance