San Antonio Reservoir (Alameda County)
Encyclopedia
San Antonio Reservoir is located in Alameda County, California
Alameda County, California
Alameda County is a county in the U.S. state of California. It occupies most of the East Bay region of the San Francisco Bay Area. As of the 2010 census it had a population of 1,510,271, making it the 7th most populous county in the state...

, about three miles east-southeast of Sunol
Sunol, California
Sunol is an unincorporated census-designated place in Alameda County, California, United States. The population was 913 at the 2010 census....

. It was built in 1964 by the City and County of San Francisco
San Francisco, California
San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...

. Formed by damming San Antonio Creek
San Antonio Creek
San Antonio Creek may refer to:* San Antonio Creek , a tributary of the Petaluma River* San Antonio Creek , in Santa Barbara County, California* Estero de San Antonio, a stream flowing into Bodega Bay...

 not far above where it flows into Alameda Creek
Alameda Creek
Alameda Creek is a large perennial stream in the San Francisco Bay Area. The creek runs for from a lake northeast of Packard Ridge to the eastern shore San Francisco Bay by way of Niles Canyon and a flood control channel.-History:...

, its purpose is to store water from the Hetch Hetchy Aqueduct
Hetch Hetchy Aqueduct
The Hetch Hetchy Aqueduct is a conveyance of Tuolumne River water runoff from federal lands in Yosemite National Park to San Francisco and its client municipalities in the greater San Francisco Bay Area...

 and local wells
Water well
A water well is an excavation or structure created in the ground by digging, driving, boring or drilling to access groundwater in underground aquifers. The well water is drawn by an electric submersible pump, a trash pump, a vertical turbine pump, a handpump or a mechanical pump...

 and watersheds
Drainage basin
A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

. It has a capacity of 50500 acre.ft. The reservoir is not open to the public.
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