Dworshak Dam

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Dworshak Dam from the south-southwest, south side of the North Fork of the Clearwater River.

Dworshak Dam, looking east from the west, on the north side of the North Fork of the Clearwater River.

Looking northeast, up the North Fork of the Clearwater River, toward the dam.

Columbia River Basin

Dworshak Dam is a hydroelectric, concrete gravity dam in Clearwater County, Idaho, on the North Fork of the Clearwater River. The dam is located four miles (6 km) northwest of the town of Orofino, and 47 miles (76 km) east of Lewiston.

Originally the name was slated to be "Bruces Eddy," but the name was changed to honor Henry C. Dworshak, a United States Senator from Idaho. The dam is the highest straight-axis concrete dam in the Western Hemisphere, and the 22nd highest dam in the world. Only two other dams in the United States exceed it in height.

Construction began in June 1966. The main structure was completed in 1972, with the generators coming online in 1973. Generating capacity is 400 megawatts, with an overload capacity of 460 MW. There are two spillway gates.

Dworshak Dam is part of the Columbia River Basin system of dams.

Dworshak Reservoir, is formed behind the dam. The lake strecthes 53 miles upstream. The North Fork of the Clearwater River, runs 2 miles downstream from the base of the dam, until it joins the South Fork of the Clearwater to form the Clearwater, which flows to the Snake River at Lewiston.