Lake Del Valle is a storage reservoir located 10 mi southeast of Livermore, in Alameda County, California. It is within Del Valle Regional Park.

Lake description

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. The lake and dam are part of the California State Water Project, as part of the South Bay Aqueduct. The lake serves in part as off-stream storage for the South Bay Aqueduct. The capacity of the lake is 77000 acre.ft, however, the lake has a flood storage of 25000 to 40000 acre.ft. Thus normally stores 37000 to 52000 acre.ft. The lake is a popular destination for hikers, bikers, and boaters. 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.

Dam description

The dam is 230 feet high and 880 feet long. Its crest elevation is 773 feet. The dam contains 4150000 cuyd of earth fill.