Columbia Plateau

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Columbia Plateau,

physiographic region of North America, c.100,000 sq mi (259,000 sq km), NW United States, between the Rocky Mts. and the Cascade Range in Washington, Oregon, and Idaho. Most of the plateau is underlaid by deposits, more than 10,000 ft (3,048 m) thick in places, of lava (mainly basalt) interbedded with sedimentary rock; older rocks outcrop in the Blue and Wallowa mts. Young lavas, scattered cinder cones, volcanic ash, and barren landscapes (including Craters of the Moon National MonumentCraters of the Moon National Monument,
53,440 acres (21,636 hectares), S central Idaho; est. 1924. This region, composed of several closely grouped volcanoes, is suggestive of a telescopic view of the moon. Volcanic activity dating back c.
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) are features of the Snake River plain in the south. Older, decayed lavas, much modified by accumulations of loess, occur in the north in the Columbia basin section; coulees (dry river canyons) and scablands (extensively eroded basalt surfaces), both carved by glacial meltwaters, are features of the region. The Columbia Plateau is an important agricultural and grazing area and is a major source of hydroelectric power.

Columbia Plateau


a lava plateau in the North American Cordillera. Located in the northwestern USA, between the Cascades to the west and the Rockies to the east. Area, approximately 500,000 sq km; elevation, 700–1,000 m.

The foundation is composed of Paleozoic and Mesozoic crystalline and sedimentary rock, covered on the surface with Miocene and Pliocene basalt; the plateau’s surface is flat or undulating and covered with loess; in the north it is morainic and dissected by the canyons of the Columbia, Snake, and other rivers with depths to 900 m (on the Columbia River) and 1,500 m (on the Snake River). There are also dry canyons, formed in Anthropogenic times (the largest is the Grand Coulee). The rivers have many waterfalls and rapids, and hydroelectric power plants have been constructed. Most of the plateau is covered with turf and grass steppes, now tilled. Wheat is the main crop.

References in periodicals archive ?
Shepherd's Grain is a registered trademark of Columbia Plateau Producers, LLC.
Bows made by the people of the Columbia Plateau, and those up through the vast country of the Cree, were strengthened by having their grips, sometimes their entire length, wrapped with the red bark, which was then sealed with Abies granais pitch.
Gollany works at the ARS Columbia Plateau Conservation Research Center in Pendleton, Oregon, while Young works at the ARS Land Management and Water Conservation Research Unit in Pullman, Washington.
TransMessis Renewable Energy Inc declared that its wholly-owned subsidiary TransMessis Columbia Plateau LLC has successfully completed an approximately $6 million restructuring of the integrated canola crushing and biodiesel production operation in Odessa, Wash.
Additional plants are planned or under way on the Columbia plateau in Morrow, Sherman, Gilliam, Wasco and Umatilla counties.
The value-added marketing business they formed, Columbia Plateau Producers LLC, today has 32 member-farmers and sells high-quality flour under the Shepherd's Grain brand to bakeries from Seattle to Northern California.
Keyser and Whitley found almost thirty references to rock art, the vision quest and shamanism on the Columbia Plateau.
The Maryhill Museum of Art stands on a remote bluff on the Columbia Plateau - an entirely incongruous setting for Rodin sculptures and Russian icons.
I love to take trips where we get to see interesting geological facets," Rice said, noting a recent ABA event provided her an opportunity to take in the Columbia Plateau in the Pacific Northwest.
Two keyhole shapes on the bandoleer bag's cloth drape are common motifs among the people of the Southern I Columbia Plateau.
The Earth Partners is currently piloting this methodology with farmers across seven million acres of the Palouse River and Columbia Plateau regions in the Pacific Northwest.
For the Columbia Plateau region of the Pacific Northwest, the focus is on topsoil blowing in the wind: The smaller particles occasionally contribute to poor air quality in the region.

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