North Fork Clearwater River
|North Fork Clearwater River|
|North Fork of the Clearwater River|
Dworshak Dam on the North Fork Clearwater, near its mouth
|- left||Kelly Creek|
|- right||Little North Fork Clearwater River|
|- location||Illinois Peak, Shoshone County|
|- elevation||5,400 ft (1,646 m)|
|- location||Ahsahka, Clearwater County|
|- elevation||980 ft (299 m)|
|Length||135 mi (217 km)|
|Basin||2,462 sq mi (6,377 km2)|
|Discharge||for Clearwater River|
|- average||5,687.5 cu ft/s (161 m3/s)|
|- max||110,000 cu ft/s (3,115 m3/s)|
|- min||799 cu ft/s (23 m3/s)|
The North Fork Clearwater River is a major tributary of the Clearwater River in the U.S. state of Idaho. From its headwaters in the Bitterroot Mountains of eastern Idaho, it flows 135 miles (217 km) westward and is dammed by the Dworshak Dam just above its mouth in north-central Idaho. Draining a rugged watershed of 2,462 square miles (6,380 km2), the river has an average flow of over 5,600 cubic feet per second (160 m3/s), accounting for a third of the discharge from the Clearwater basin. The river drains parts of Clearwater, Shoshone, Latah, and Idaho counties. Most of the watershed is managed by the U.S. Forest Service.
It rises in the Bitterroot Mountains, which form the far eastern border of the State of Idaho, on the Idaho-Montana border. The headwaters are on the south flank of the triple summits of Graves Peak, Illinois Peak and Gold Crown Peak, very near St. Joe Lake, the head waters of the St. Joe River, which flows into Coeur d'Alene Lake. The river immediately flows southwest through a narrow gorge, joined by numerous small tributaries. The river turns southeast to join with Long Creek and Lake Creek, which flow in from the east. After joining these two large creeks, the river turns west, then receives Elizabeth Creek from the right as it veers to the south. Then it turns sharply west into a wider valley, where it receives its largest tributary thus far, 25-mile (40 km) Kelly Creek, from the left near an unincorporated community, and turns west and southwest, paralleled by Forest Service Road #250. It then receives 4 July Creek from the left, Weitas Creek from the left, Orogrande Creek from the left and Quartz Creek from the right.
Flowing northeast then swinging back west, the river receives Skull Creek from the northeast just downstream of the Quartz Creek confluence. Beaver Creek enters from the south and Isabella Creek from the north. With high buttes towering to the north and comparatively gradual mountains rising on the south, the river enters Dworshak Reservoir, formed by the massive Dworshak Dam. About 8 miles (13 km) later, the flooded canyon meets the canyon of the Little North Fork Clearwater River on the right, which is also flooded for some distance. Still narrow and winding, following the river's original course, the reservoir branches to the south and spreads wider as it enters more gradual terrain. Reeds Creek and Elk Creek, formerly major tributaries of the river, now flow directly into the lake. The reservoir then ends at the Dworshak Dam, a 717 ft (219 m) high concrete gravity dam. Below the dam the river runs southeast for a little over a mile, crosses under Idaho State Route 7, and meets the Clearwater River at Ahsahka.
The North Fork Clearwater's watershed covers 2,462 square miles (6,380 km2) of land in the lower Idaho Panhandle. The watershed is approximately 26.6 percent of the 9,645-square-mile (24,980 km2) Clearwater River watershed, itself a tributary of the Snake River. The drainage area of the St. Joe River abuts the North Fork drainage to the north, Latah Creek to the northeast, the Middle Fork Clearwater to the east and south, the South Fork Clearwater and Snake River to the south, and the Potlatch River and Clearwater to the west. The basin is very lightly populated - the largest and only incorporated town is Elk River, Idaho, population 149. The logging industry makes up the primary economy of the North Fork's watershed.
On average, streamflow in the North Fork is approximately 5,200 cubic feet per second (150 m3/s), ranging from 1,000 cubic feet per second (28 m3/s) to over 30,000 cubic feet per second (850 m3/s). The USGS operated a stream gauge near the mouth of the river from 1927 to 1968. In that time period, the highest recorded flow was 100,000 cubic feet per second (2,800 m3/s) on December 23, 1933. The lowest peak was 12,200 cubic feet per second (350 m3/s) on 18 May 1941.
- "North Fork Clearwater River". Geographic Names Information System. United States Geological Survey. 1979-06-21. Retrieved 2009-08-05.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 3, 2011
- "North Fork Clearwater River Basin". Idaho Department of Water Resources. www.idwr.idaho.gov. Retrieved 2009-08-05.
- Robbins, p. 65.
- Map of the North Fork Clearwater River (Map). Cartography by NAVTEQ. Google Maps. 2009. Retrieved 2009-08-05.
- Benke and Cushing, p. 632
- "North Fork Clearwater Basin" (PDF). Idaho Department of Water Resources. Comprehensive State Water Plan Executive Summary. Retrieved 2009-08-05.[dead link]
- U.S. Geological Survey Geographic Names Information System: Kelly Creek
- U.S. Geological Survey Geographic Names Information System: Little North Fork Clearwater River
- U.S. Geological Survey Geographic Names Information System: Elk Creek
- "Upper North Fork Clearwater River Subbasin Assessment and Total Maximum Daily Loads" (PDF). Idaho Department of Environmental Quality. www.deq.state.id.us. October 2003. Retrieved 2009-08-05.
- "USGS Gage #13341000 on the North Fork Clearwater River at Ahsahka, Idaho". National Water Information System. United States Geological Survey. 1927–1968. Retrieved 2009-08-05.