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Powder River (Apsáalooke: ''Chakadee Wakpa''; Assiniboine: ''Caȟní wakpá '' ) is a tributary of the Yellowstone River, approximately long in northeastern Wyoming and southeastern Montana in the United States. It drains an area historically known as the Powder River Country on the high plains east of the Bighorn Mountains. It rises in three forks in north central Wyoming. The North and Middle forks rise along the eastern slope of the Bighorn Mountains. The South Fork rises on the southern slopes of the Bighorn Mountains west of Casper. The three forks meet on the foothills east of the Bighorns near the town of Kaycee. The combined stream flows northward, east of the Bighorns, and into Montana. It is joined by the Little Powder near the town of Broadus, and joins the Yellowstone approximately downriver from Miles City, Montana. The Powder River was so named (in the English language as well as in local indigenous languages) because the sand along a portion of its banks resembles powder or dust. ==See also== *Powder River Country *Fort McKinney (Wyoming) *List of Wyoming rivers *List of rivers of Montana *Montana Stream Access Law 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「Powder River (Wyoming and Montana)」の詳細全文を読む スポンサード リンク
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