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Mammoth Pool Reservoir: Wikis


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Mammoth Pool Reservoir
Location Sierra National Forest
Fresno County, California
Madera County, California
Coordinates 37°21′15″N 119°18′32″W / 37.3541°N 119.309°W / 37.3541; -119.309Coordinates: 37°21′15″N 119°18′32″W / 37.3541°N 119.309°W / 37.3541; -119.309
Lake type Reservoir
Primary inflows San Joaquin River
Primary outflows San Joaquin River
Catchment area 998 sq mi (2,580 km2)
Basin countries United States
Max. length 820 ft (250 m)
Max. width 1.5 mi (2.4 km)
Surface area 1,100 acres (450 ha)
Water volume 123,000 acre·ft (152,000 dam³)
Surface elevation 3,330 ft (1,010 m)
References U.S. Geological Survey Geographical Names Information System: Mammoth Pool Reservoir

Mammoth Pool Reservoir is a artificial lake on the San Joaquin River, on the border between Fresno County and Madera County, California, about 45 miles (72 km) north-northeast of Fresno. The 123,000 acre·ft (152,000 dam³) reservoir is formed by Mammoth Pool Dam, an earth-fill dam completed in 1960.[1] It was built by Southern California Edison for hydroelectricity production. The dam's power plant can produce up to 190 megawatts. The dam, reservoir and power plant are part of the Big Creek Hydroelectric Project, perhaps the most extensive hydroelectric system in the world.

Besides electricity generation, the reservoir is also a recreation area. Activities at the lake include, swimming, fishing, camping and boating. The reservoir is closed to the public during the month of May and the first half of June to allow migrating deer to swim across the reservoir. They spend the summer in the Sierra Nevada. Additionally, the reservoir is inaccessible following the first snowstorm, as the road to it is not snowplowed. This usually occurs in November.[2]


  1. ^ Department of Water Resources (2009). "Station Meta Data: Pine Flat Dam (PNF)". California Data Exchange Center. State of California. Retrieved 2009-08-28.  
  2. ^ US Forest Service (22 February 2009). "Sierra National Forest - Recreation, Lakes & Reservoirs:". U.S. Department of the Interior. Retrieved 2009-08-28.  

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