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Powder River (Oregon)
The Powder River is a tributary of the Snake River, approximately long,〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed May 3, 2011〕 in northeast Oregon in the United States. It drains an area of the Columbia Plateau on the eastern side of the Blue Mountains. It flows almost entirely within Baker County but downstream of the city of North Powder forms part of the border between Baker County and Union County.
==History==
The name ''Powder River'' is first recorded in the journals of Peter Skene Ogden without notation of the origin of the name. Explorer Donald Mackenzie likely named the river. William C. McKay, grandson of John Jacob Astor's partner Alexander MacKay, says that the origin of the name is from the powdery and sandy soil along the shores of the river, from the Chinook Jargon ''polalle illahe''. It appears on Lewis and Clark's maps as ''Port-pel-lah''.
In 1988, of the Powder River was designated Wild and Scenic. Between the Thief Valley Dam and the Oregon Route 203 bridge, this stretch flows through a rugged canyon with spectacular geologic formations.〔(【引用サイトリンク】publisher=National Wild & Scenic Rivers )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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