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Oregon's largest lake by surface area, located near the California border, fed by the Williamson River (Oregon), and drained by the Link River into Lake Ewauna: North and South Twin Lakes: two small lakes near the Cascade Lakes Scenic Byway Lake Umatilla: impoundment of the Columbia River formed by the John Day Dam: Wahtum Lake
The Washington cities of Spokane, Yakima and Pasco, and the Oregon city of Pendleton, lie on the Columbia Plateau. 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]
Overview of Oregon river drainage basins. This is a partial listing of rivers in the state of Oregon, United States. This list of Oregon rivers is organized alphabetically and by tributary structure. The list may also include streams known as creeks, brooks, forks, branches and prongs, as well as sloughs and channels.
The Blue Mountains are a mountain range in the northwestern United States, located largely in northeastern Oregon and stretching into extreme southeastern Washington.The range has an area of about 15,000 square miles (39,000 km 2), stretching east and southeast of Pendleton, Oregon, to the Snake River along the Oregon–Idaho border.
Listed in order going downstream: British Columbia: . Headwaters to the Canada–United States border: . Canal Flats; Fairmont Hot Springs; Windermere; Invermere; Radium Hot Springs ...
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.
Crater Lake, Oregon. 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
The main cities are all located alongside rivers or lakes; most of them are named after the river or lake they adjoin. Farther east, the climate becomes less arid, with annual rainfall increasing as one goes east to 21.2 inches (540 mm) in Pullman, near the Washington–Idaho border. [10]