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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 〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed May 3, 2011〕 westward and is dammed by the Dworshak Dam just above its mouth in north-central Idaho. Draining a rugged watershed of , the river has an average flow of over , 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. Some of the Fish of the River include Westslope Cutthroat Trout, Rainbow Trout, Mountain Whitefish]], and the endangered Bull Trout It also is host to an annual Kokanee Salmon run over Labor Day Weekend. The North fork also lays claim to Grizzly Bears, Cougars, Deer, Moose, Black Bear, Elk, Grey Wolves, and Ospreys. The River used to hold a prosperous Steelhead run befor 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, Kelly Creek,〔Robbins, p. 65.〕 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.〔Benke and Cushing, p. 632〕 About 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 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.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「North Fork Clearwater River」の詳細全文を読む スポンサード リンク
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