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The ecoregion extends across a wide swath of the Columbia River Basin from The Dalles, Oregon to Lewiston, Idaho to Okanogan, Washington near the Canada–U.S. border. It includes nearly 500 miles (800 km) of the Columbia River, as well as the lower reaches of major tributaries such as the Snake and Yakima rivers and the associated drainage basins.
The Columbia River (Upper Chinook: ... Bathymetric map of the mouth of the Columbia River. ... The Columbia Glaciated ecoregion, about a third of the total watershed ...
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 level III ecoregions in Oregon are the Coast Range (1), Willamette Valley (3), Cascades (4), Eastern Cascades Slopes and Foothills (9), Columbia Plateau (10), Blue Mountains (11), Snake River Plain (12), Klamath Mountains (78), and Northern Basin and Range (80). (Compare to map of Level IV ecoregions.)
Most of the water in this ecoregion is fresh water and contained in rivers, lakes, and groundwater. Washington, Oregon, and Idaho are mainly drained by the Columbia River, its tributaries, and other streams that flow to the Pacific Ocean. The Columbia River Basin is the fourth largest watershed in North
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
The Maritime-Influenced Zone ecoregion is the portion of the Blue Mountains ecoregion that directly intercepts marine weather systems moving east through the Columbia River Gorge. It is characterized by a dissected, gently-sloping to hilly volcanic plateau and mountain valleys. Elevation varies from 3,000 to 6,000 feet (914 to 1,829 m).
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology, physiography, vegetation, climate, soils, land use, wildlife distributions, and hydrology.