The Twin Peaks Reservoir, 2007. Photo by rick, CC-BY.

The Twin Peaks Reservoir is a 10.5-million-gallon storage reservoir made out of 6-inch-thick (150 mm) reinforced-concrete slabs.  It's up in Twin Peaks.  The reservoir is made up  of two tanks, and each is able to empty separately for safety reasons.

The Twin Peaks Reservoir is the backbone of the San Francisco Fire Department's Auxiliary Water Supply System (AWSS).

The reservoir was planned by San Francisco Fire Chief Dennis T. Sullivan. It was developed in the 1980s.

See also