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Deep Loess Foothills

Ecoregion on Columbia Plateau in OR, WA

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The Deep Loess Foothills ecoregion includes lower, northwest-facing slopes of the eastern Blue Mountains. Both The Deep Loess Foothills ecoregion and the Palouse in Washington have highly-productive soil, equivalent average annual precipitation (16 to 23 inches), and similar land use capability. However, these areas differ in physiography and stream density. Instead of the dune-like ridges of the Palouse, the Deep Loess Foothills (10i) contain step-like terraced ridges that rise to the forested Blue Mountains. The Deep Loess Foothills ecoregion also has more perennial streams than the Palouse; they are fed by the higher rainfall and snowpack that occurs in the Blue Mountains.

— EPA

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Ecoregion