Dworshak Dam
Dworshak Dam is a concrete gravity dam in the western United States, on the North Fork of the Clearwater River in north central Idaho. In Clearwater County, the dam is located approximately four miles (6 km) northwest of Orofino and impounds the Dworshak Reservoir for flood control and hydroelectricity generation.
| Dworshak Dam | |
|---|---|
Aerial view from southwest, with spillways open | |
Location in the United States Location in Idaho | |
| Country | United States |
| Location | Clearwater County, Idaho |
| Coordinates | 46°30′54″N 116°17′46″W |
| Purpose | Water storage, power |
| Construction began | 1966 |
| Opening date | 1973 |
| Construction cost | $327 million ($2.24 billion in 2024) |
| Owner(s) | U.S. Army Corps of Engineers |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | North Fork of the Clearwater River |
| Height | 717 ft (219 m) |
| Length | 3,287 ft (1,002 m) |
| Spillways | Service, 2x tainter gates |
| Spillway capacity | 150,000 cu ft/s (4,200 m3/s) |
| Reservoir | |
| Creates | Dworshak Reservoir |
| Total capacity | 3,468,000 acre⋅ft (4.278 km3) |
| Active capacity | 2,016,000 acre⋅ft (2.487 km3) |
| Catchment area | 2,440 sq mi (6,300 km2) |
| Surface area | 17,090 acres (6,920 ha) (max) |
| Normal elevation | 1,600 feet (490 m) AMSL |
| Power Station | |
| Commission date | 1973 |
| Hydraulic head | 560 ft (170 m) |
| Turbines | 2x 90 MW 1x 220 MW |
| Installed capacity | 400 MW 460 MW (max. planned) |
| Annual generation | 1.693 billion KWh |
With a height of 717 feet (219 m), Dworshak is the third tallest dam in the U.S. and the tallest straight-axis concrete dam in the Western Hemisphere. Construction of the dam by the U.S. Army Corps of Engineers (USACE) began in 1966 and was completed in 1973.
Lacking fish ladders, the dam blocks fish passage and completely extirpated anadromous fish migration into the upper reaches of the North Fork and its tributaries in Idaho.
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