|
The Walla Walla River is a tributary of the Columbia River, joining the Columbia just above Wallula Gap in southeastern Washington in the United States. The river flows through Umatilla County, Oregon, and Walla Walla County, Washington.〔 Its drainage basin is in area.〔(Walla Walla Subbasin Plan ), Northwest Power and Conservation Council〕 ==Course== The headwaters of the Walla Walla River lie in the Blue Mountains of northeastern Oregon. The river originates as the North and South Forks of the Walla Walla River. The surrounding forested land holds a network of hiking and mountain-biking trails. The confluence of the North and South Forks lies east of Milton–Freewater, Oregon. The river flows eastward to reach Milton–Freewater, which is built along its banks, and then flows northward through Milton–Freewater. Irrigation water is drawn from the river here and at numerous locations along the river. The Walla Walla River flows southwest of the city of Walla Walla in the Walla Walla valley. Mill Creek, which flows through the city of Walla Walla, joins the Walla Walla River at the Whitman Mission west of the city of Walla Walla. The Touchet River joins the Walla Walla at the town of Touchet, Washington. The annual mean discharge of the Walla Walla River just below the Touchet River confluence is . The maximum recorded discharge was in 1964.〔(Water Resources Data, Washington Water year 2005 ), USGS Water-Data Reports〕 The river enters the Columbia a mile south of the town of Wallula just north of Wallula Gap. The section of the Columbia River is called Wallula Lake, the reservoir impoundment created by McNary Dam. 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「Walla Walla River」の詳細全文を読む スポンサード リンク
|