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Columbia Plateau, the geographic region in the Pacific Northwest commonly referred to as the Columbia Basin; Columbia Plateau (ecoregion), an ecoregion in the U.S. states of Oregon and Washington; Columbia River drainage basin, a drainage basin covering parts of U.S. and Canada; Columbia River Basalt Group, a set of rock layers that underlies ...
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.
Without Coulee Dam and the greater Columbia Basin Project, much of North Central Washington State would be too arid for cultivation. According to the federal Bureau of Reclamation the yearly value of the Columbia Basin Project is $630 million in irrigated crops, $950 million in power production, $20 million in flood damage prevention, and $50 ...
In the United States and Canada the term watershed is often used to mean drainage basin. 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 ...
The Columbia Plateau is an important geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho. [1] It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains , cut through by the Columbia River .
The Columbia Plateau ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency (EPA) encompassing approximately 32,100 square miles (83,139 km 2) [1] of land within the U.S. states of Washington, Oregon, and Idaho.
Averaging a major dam every 72 miles (116 km), the rivers in the Columbia watershed combine to generate over 36,000 megawatts of power, with the majority coming on the main stem. Grand Coulee Dam is the largest producer of hydroelectric power in the United States, [1] generating 6,809 megawatts, over one-sixth of all power in the basin.
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.