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Western Okanogan Semiarid Foothills

Ecoregion in WA

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The Western Okanagon Semiarid Foothills is typically covered with grasses, shrubs and scattered ponderosa pine and Douglas-fir. It includes savannas, near-savannas, and woodlands. Vegetation pattern is strongly driven by slope aspect. North-facing slopes have closed Douglas-fir and ponderosa pine forests and south-facing slopes are covered in open ponderosa pine woodland or shrubsteppe. Understories are generally dominated by bunchgrass steppe species, such as, Idaho fescue, rough fescue, bluebunch wheatgrass, or needlegrasses. Some stands have a short deciduous shrub layer of common snowberry. The Western Okanagon Semiarid Foothills ecoregion contains antelope bitterbrush, an eastern Cascadian shrub that is absent from other parts of Ecoregion 15. The Western Okanagon Semiarid Foothills ecoregion is more warmer, more xeric, and has more extensive woodlands and less extensive forests than the Okanogan-Colville Xeric Valleys and Foothills (15r). Rock outcrops are common. Land use is dominated by livestock grazing.

— EPA

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