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Willamette Valley

Ecoregion in OR, WA

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The Willamette Valley ecoregion contains terraces and floodplains of the Willamette River system, along with scattered hills, buttes, and adjacent foothills. Originally, it was covered by prairies, oak savannas, coniferous forests, extensive wetlands, and deciduous riparian forests. Elevation and relief are lower and the vegetation mosaic differs from the coniferous forests of the surrounding Coast Range (1), Cascades (4), and Klamath Mountains (78). Mean annual rainfall is 37 to 60 inches and summers are generally dry; overall, precipitation is lower than in the surrounding mountains. Today, the Willamette Valley contains the bulk of Oregon’s population, industry, commerce, and cropland. Productive soils and a temperate climate make it one of the most important agricultural areas in Oregon.

— EPA

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