North Fork Clearwater River North Fork of the Clearwater River, The North Fork
Dworshak Dam on the North Fork Clearwater, near its mouth
Location of the mouth of the North Fork Clearwater River in Idaho Show map of Idaho North Fork Clearwater River (the United States) Show map of the United States
Location
Country	United States
State	Idaho
Physical characteristics
Source	Bitterroot Mountains
• location	Illinois Peak, Shoshone County
• coordinates	47°00′11″N 115°06′16″W / 47.00306°N 115.10444°W / 47.00306; -115.10444
• elevation	5,400 ft (1,600 m)
Mouth	Clearwater River
• location	Ahsahka, Clearwater County
• coordinates	46°30′00″N 116°19′50″W / 46.50000°N 116.33056°W / 46.50000; -116.33056
• elevation	980 ft (300 m)
Length	135 mi (217 km)
Basin size	2,462 sq mi (6,380 km2)
Discharge
• location	Clearwater River
• average	5,687.5 cu ft/s (161.05 m3/s)
• minimum	799 cu ft/s (22.6 m3/s)
• maximum	110,000 cu ft/s (3,100 m3/s)
Basin features
Tributaries
• left	Kelly Creek, Wetias Creek
• right	Little North Fork Clearwater River, Elizabeth Creek

The North Fork Clearwater River is a major tributary of the Clearwater River in the U.S. state of Idaho.^[1] From its headwaters in the Bitterroot Mountains of eastern Idaho, it flows 135 miles (217 km)^[2] 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.^[3] The river drains parts of Clearwater, Shoshone, Latah, and Idaho counties. Most of the watershed is managed by the U.S. Forest Service. Some of the fish of the river include westslope cutthroat trout, rainbow trout, mountain whitefish, and the threatened bull trout. It also has smallmouth bass and a kokanee salmon run, both from Dworshak Reservoir. The North Fork drainage is home to grizzly bears, cougars, deer, moose, black bear, elk, grey wolves, and osprey. The river used to have a large steelhead run before the implementation of Dworshak Dam. The North Fork of the Clearwater is located within the Clearwater National Forest

Course

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,^[4] 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.^[5]

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.^[6] 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.^[5]

Watershed

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.^[7]

The major tributaries to the North Fork Clearwater River are (proceeding downstream) Kelly Creek,^[8] the Little North Fork Clearwater River,^[9] and Elk Creek.^[10]

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).^[11] 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.^[12]

See also

• List of Idaho rivers
• List of longest streams of Idaho

References

Works cited

• Benke, Arthur C.; Cushing, Colbert E. (2005). Rivers of North America. Academic Press. ISBN 0-12-088253-1.
• Robbins, Chuck (2003). On the Fly Guide to the Northern Rockies. Wilderness Adventures Press. ISBN 1-932098-01-1.