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San Antonio Reservoir is located in Alameda County, California, about three miles east-southeast of Sunol. It was built in 1964 by the City and County of San Francisco. Formed by damming San Antonio Creek not far above where it flows into Alameda Creek, its purpose is to store water from the Hetch Hetchy Aqueduct and local wells and watersheds. It has a capacity of 50,500 acre-feet (62,000,000 m³). The reservoir is not open to the public.