Lake Del Valle is a storage reservoir located 10mi southeast of Livermore, in Alameda County, California. It is within Del Valle Regional Park.Lake DescriptionIt is on Arroyo Valle (Spanish for "creek of the valley") in the Diablo Range. The lake 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 77000acre.ft, however, the lake has a flood storage of 25000to. Thus normally stores 37000to. 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.Dam DescriptionThe dam is 230feet high and 880feet long. Its crest elevation is 773 feet. The dam contains 4150000cuyd of earth fill.
