Pit-3 Dam | |
---|---|
Official name | Pit Number Three Dam |
Country | United States |
Location | Shasta County, California |
Coordinates | 41°01′18″N121°40′33″W / 41.02167°N 121.67583°W |
Owner(s) | Pacific Gas and Electric Company [1] |
Dam and spillways | |
Impounds | Pit River |
Height | 130 ft (40 m) [2] |
Length | 494 ft (151 m) [2] |
Width (crest) | 30 ft (9.1 m) [1] |
Width (base) | 110 ft (34 m) [1] |
Reservoir | |
Creates | Lake Britton |
Total capacity | 41,877 acre⋅ft (51,655,000 m3) [2] |
Catchment area | 4,700 square miles (12,000 km2) [1] |
Surface area | 1,265 acres (5.12 km2) [3] |
Power Station | |
Type | Run-of-the-river |
Hydraulic head | 600 feet (180 m) [2] |
Installed capacity | 69.9 MW [2] |
Annual generation | 333,606,000 KWh (2001–2012) [4] |
Pit-3 Dam (also known as Pit Number Three Dam and Dam Number Three) is a hydroelectric dam on the Pit River in northern California in the United States. It forms Lake Britton, and is owned by the Pacific Gas and Electric Company (PG&E).
Pit 3 is a curved concrete gravity dam with a height of 130 ft (40 m) and length of 494 ft (151 m). The dam has a gated spillway with three steel gates and three inflatable rubber gates. [2] : 6 An intake structure at the dam diverts water into a 19-foot (5.8 m) diameter, 21,203-foot (6,463 m) long tunnel that connects to the Pit 3 hydroelectric plant. There are three 23.3 MW generators, for a total capacity of 69.9 MW. [2] : 6
Lake Britton, formerly known as Pit 3 Reservoir, has a maximum water level of 2,737.5 ft (834.4 m); however, the lake is usually kept below 2,736.5 ft (834.1 m) to avoid flooding parts of McArthur–Burney Falls Memorial State Park. [2] : 279 The gross storage capacity is 41,877 acre-feet (51,655,000 m3) and the usable (active) storage is 14,443 acre-feet (17,815,000 m3). [2] : 6
The lake level changes on a weekly basis with greater drawdowns during the weekdays for power generation, and refilling on the weekends. [2] : 9 In addition to generating power at the Pit 3 hydroelectric station, the reservoir also helps regulate water flowing through the Pit 4 and Pit 5 stations downstream.
The dam is the place where Pacific Crest Trail crosses the Pit River. [2] : 279
Construction was completed in 1925 . [5]
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