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The Clark Fork is a river in the U.S. states of Montana and Idaho, approximately long. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and northern Idaho in the watershed of the Columbia River. The river flows northwest through a long valley at the base of the Cabinet Mountains and empties into Lake Pend Oreille in the Idaho Panhandle. The Pend Oreille River in Idaho, Washington, and British Columbia, Canada which drains the lake to the Columbia in Washington, is sometimes included as part of the Clark Fork, giving it a total length of 479 mi (771 km), with a drainage area of 25,820 sq mi (66,870 km²). In its upper 20 mi (32 km) in Montana near Butte, it is known as Silver Bow Creek. Interstate 90 follows much of the upper course of the river from Butte to northwest of Missoula. The highest point within the river's watershed is Mount Evans at in Deer Lodge County, Montana along the Continental Divide.〔(【引用サイトリンク】url=http://www.peakbagger.com/peak.aspx?pid=4876 )〕 The Clark Fork is a Class I river for recreational purposes in Montana from Warm Springs Creek to the Idaho border. The Clark Fork should not be confused with the Clarks Fork of the Yellowstone River, which is located in Montana and Wyoming. ==Description== It rises as Silver Bow Creek〔 in southwestern Montana, less than 5 mi (8 km) from the Continental Divide near downtown Butte, from the confluence of Basin and Blacktail creeks. It flows northwest and north through a valley in the mountains, passing east of Anaconda, where it changes its name to the Clark Fork at the confluence with Warm Springs Creek, then northwest to Deer Lodge. Near Deer Lodge it receives the Little Blackfoot River. From Deer Lodge it flows generally northwest across western Montana, passing south of the Garnet Range toward Missoula. Five miles east of Missoula, the river receives the Blackfoot River. Northwest of Missoula, the river continues through a long valley along the northeast flank of the Bitterroot Range, through the Lolo National Forest. It receives the Bitterroot River from the south-southwest approximately 5½ mi west of downtown Missoula. Along the Cabinet Mountains the river receives the Flathead River from the east near Paradise. It receives the Thompson River from the north near Thompson Falls in southern Sanders County. At Noxon, Montana, along the Cabinet Mountains and the northern end of the Bitterroots near the Idaho border, the river is impounded by the Noxon Rapids Dam to form a 20 mi (32 km) long reservoir. It crosses into eastern Bonner County in north Idaho between the towns of Heron, Montana and the town of Cabinet, Idaho. Approximately 8 mi (13 km) west of the Idaho-Montana state line, the river enters the north eastern end of Lake Pend Oreille, near the town of Clark Fork. 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「Clark Fork River」の詳細全文を読む スポンサード リンク
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