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The Columbia Basin. The Columbia River drainage basin is the drainage basin of the Columbia River in the Pacific Northwest region of North America.It covers 668,000 km 2 or 258,000 sq mi. [1] In common usage, the term often refers to a smaller area, generally the portion of the drainage basin that lies within eastern Washington.
Tributaries and sub-tributaries are hierarchically listed in order from the mouth of the Columbia River upstream. Major dams and reservoir lakes are also noted. Map of the Columbia drainage Basin with the Columbia River highlighted and showing the major tributaries
Dams of the Columbia River Basin. Click to view higher resolution and read legend. Hydroelectric generators in the basin sized by capacity. 17 dams on the British Columbia side of Canada-US border not shown. There are more than 60 dams in the Columbia River watershed in the United States and Canada. Tributaries of the Columbia River and their ...
The term Columbia Basin is used to refer not only to the entire drainage basin but also to subsets of the river's watershed, such as the relatively flat and unforested area in eastern Washington bounded by the Cascades, the Rocky Mountains, and the Blue Mountains. [211]
It joins the Columbia River just downstream from the Tri-Cities, Washington, in the southern Columbia Basin. The river's watershed, which drains parts of six U.S. states, is situated between the Rocky Mountains to the north and east, the Great Basin to the south, and the Blue Mountains and Oregon high desert to the west.
Listed in order going downstream: British Columbia: . Headwaters to the Canada–United States border: . Canal Flats; Fairmont Hot Springs; Windermere; Invermere; Radium Hot Springs ...
Columbia River Basin. Wallula Gap (/ w ə ˈ l uː l ə /) is a large water gap of the Columbia River in the Northwestern United States, in Southeastern Washington.It cuts through the Horse Heaven Hills basalt anticlines in the Columbia River Basin, just south of the confluence of the Walla Walla and Columbia rivers.
The Columbia River Basalt Group (including the Steen and Picture Gorge basalts) extends over portions of four states. The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt provinces on Earth, covering over 210,000 km 2 (81,000 sq mi) mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. [1]