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Palouse Hills

Ecoregion on Columbia Plateau in WA, ID

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The Palouse Hills are the western foothills of the Northern Rocky Mountains (15). The ecoregion boundaries define an unforested loess-covered area differing from other such areas in the Columbia Plateau by the increased moisture availability near the mountains. The soil has a higher organic matter and clay content and is highly productive. Original plant cover has been almost entirely supplanted by wheat farms. Water and wind erosion are major management issues. Perennial streams originate from the mountains to the east. Smaller, loess-bottomed streams rise within the ecoregion and are intermittent. Many of these streams are plowed through and tiled.

— EPA

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Ecoregion