San Antonio Reservoir, body of water

San Antonio Reservoir lies in Alameda County, about three miles east-southeast of Sunol, formed by the James H. Turner Dam across San Antonio Creek just above its confluence with Alameda Creek. Built in 1964 by the City and County of San Francisco, it holds 50,500 acre-feet (62,300,000 m3) of water from the Hetch Hetchy Aqueduct, local wells and watersheds. The reservoir is not open to the public.

The James H. Turner Dam was built in 1964 to store water for the region and ensure water security. Since its construction, the facility has supported the water supply for local cities and agricultural areas.

San Antonio Reservoir is closed to the public, so the site is known mainly through its role in the Hetch Hetchy system rather than through visits. Its name follows San Antonio Creek, the stream the James H. Turner Dam crosses just above its confluence with Alameda Creek.

The reservoir is not open to the public, so there is no shoreline access, trail or viewpoint on the property; the water and James H. Turner Dam can only be seen from outside the boundary, for instance from the surrounding roads near Sunol. Plan viewing as a roadside stop rather than a visit.

San Antonio Reservoir holds 50,500 acre-feet (about 62.3 million cubic metres) behind the James H. Turner Dam on San Antonio Creek, just above its confluence with Alameda Creek. The reservoir is closed to the public, so the water and dam are seen only from outside the property.