Tank Hill, Public park in Twin Peaks, San Francisco, US

Tank Hill is a park in Twin Peaks with rocky outcroppings on its north side and a summit elevation of approximately 650 feet (200 meters). The hillside offers open paths and stairs that provide different vantage points and views across the neighborhood.

The hill is named for the 500,000-gallon Clarendon Heights Water Tank built by the Spring Valley Water Company in 1894. The City of San Francisco acquired the water company in the 1930s and replaced the tank with the Twin Peaks Reservoir; the tank itself was removed in 1957, leaving a concrete platform. In 1961 the city rezoned the land for single-family housing and sold it to a developer for $230,000, but a campaign led by Supervisor Ron Pelosi led to its repurchase as park land, authorized on September 28, 1977.

The hill's name comes from the Clarendon Heights Water Tank that stood on the summit until 1957; the concrete platform left behind is now the viewpoint. A bench faces east, and on the 4th of July the summit draws people watching fireworks over the City and across the bay to Oakland and the East Bay.

Access is available through stairs and paths from Twin Peaks Boulevard, and the park is open throughout the day. Visitors should expect a steep climb and bring comfortable walking shoes.

The 1894 tank was built by the Spring Valley Water Company, not the city, and held 500,000 gallons. After the city bought the company in the 1930s, the tank was replaced by the Twin Peaks Reservoir and removed in 1957, leaving only a concrete platform on the summit.