San Antonio DamSan Antonio Dam is an earthen dam on the San Antonio River in Monterey County, California in the United States. The dam impounds Lake San Antonio, a reservoir with a capacity of, located west of Camp Roberts.HistorySan Antonio Dam was completed in 1965.AccessThe dam is accessible from Exit 252 of U.S. Route 101 by taking Jolon Road to Nacimiento Lake Drive to Vista Road.OperationsWater released from San Antonio Dam travels down the San Antonio River to join the Salinas River on its way to Monterey Bay.NomenclatureAnother dam with the same name is located on San Antonio Creek in San Bernardino County, California.