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Willamette River and Tributaries Gallery Forest

Ecoregion in OR

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The Willamette River and Tributaries Gallery Forest ecoregion includes low-gradient, meandering, river channels, broad floodplains, oxbow lakes, and meander scars. Riparian gallery forests containing ash, black cottonwood, alder, and bigleaf maple once grew on its fertile, alluvial soils, but most have been replaced by agriculture and rural residential, suburban, and urban development. Ecoregion 3b includes the major historic floodplains of the Willamette River system that rarely function today due to flood control dams upstream. Dams in the upper Willamette Basin reduce both flood frequency and flood volume, which are related to the decline of the endemic, endangered Oregon chub.

— EPA

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