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Lower Snake and Clearwater Canyons

Ecoregion on Columbia Plateau in WA, ID

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The Lower Snake and Clearwater Canyons ecoregion cuts deeply through the basalt layers of the Columbia Plateau (10) and has isolated plateau fragments of the Dissected Loess Uplands (10f). The depth of the canyons, up to 2,000 feet, create drier conditions than those in Ecoregion 10f and mean annual precipitation is about 10 inches. Outside of human population centers and transportation corridors, canyons provide wildlife habitat for bighorn sheep and game birds.

— EPA

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