Cabinet Gorge Dam

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Cabinet Gorge Dam
Cabinet Gorge Dam.JPG
Location Bonner County, Idaho
Coordinates 48°5′12″N 116°3′52″W / 48.08667°N 116.06444°W / 48.08667; -116.06444 [1]
Construction began 1951
Opening date 1953[2]
Construction cost $47 million
Operator(s) Avista Corp.
Dam and spillways
Impounds Clark Fork River
Height 111 feet (34 m)[2]
Length 600 feet (183 m)[2]
Width (base) 40 feet
Reservoir
Creates Cabinet Gorge Reservoir
Total capacity 106,000 acre feet (131,000,000 m3)[2]
Catchment area 22,073 sq mi (57,169 km²)[2]
Surface area 3,200 acres (13 km²)[2]
Power station
Turbines 4 turbines; 1 Kaplan, 1 mixed flow, 2 propellers
Installed capacity 231 MW

Cabinet Gorge Dam is a concrete gravity-arch hydroelectric dam on the Clark Fork River, in the U.S. state of Idaho. The dam is located in the Idaho Panhandle, just west of the Montana border. Cabinet Gorge Reservoir extends into Montana, nearly to Noxon Rapids Dam. The purpose of the dam is for hydroelectricity.

Construction[edit]

Construction on the Cabinet Gorge Dam began in 1951 by the Morrison Knudsen Corporation. The Clark Fork River had to be diverted with two coffer dams and speed was necessary because Spring flooding threatened the river diversion and coffer dam integrity. 32 tons of dynamite was used to blast 50,000 cubic yards of rock from the canyon walls in order to prep the construction site. Water was diverted through two 1,000 ft (300 m) tunnels, and a half-million cubic yards of earth was excavated from the site overall. Construction on the dam was complete in 1952 and the reservoir was filled in 1951, half the estimated time.[3]

The dam is currently owned and operated by the power company Avista.

References[edit]