Lake Del Valle
 Lake Del Valle is an artificial lake located 10 miles (16 km) southeast of Livermore California on Arroyo del Valle (Spanish for creek of the valley) in Del Valle Regional Park. 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.