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Spokane Valley Outwash Plains

Ecoregion in WA, ID

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The Spokane Valley Outwash Plain is a gently rolling expanse that includes the southern end of the Purcell Trench, Rathdrum Prairie, and the Spokane Valley. The Purcell Trench and the Spokane Valley served as the main outlet for the Pleistocene Missoula floods. The flood water and the glacial outwash entering from the northern valleys left a coarse, gravelly soil base which becomes more arable in the southern Spokane valley where it was covered by glacial lake sediment. Potential natural vegetation includes dry open ponderosa pine and Douglas-fir woodland, unlike neighboring ecoregions 15o and 15u, that have a maritime-influence and a moist forest community.

— EPA

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Ecoregion