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Umpqua Interior Foothills

Ecoregion in OR

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Unlike the purely mountainous terrain of the Inland Siskiyous (78e) or the broader Rogue/Illinois Valleys (78a), the Umpqua Interior Foothills ecoregion is a complex of foothills and narrow valleys containing fluvial terraces and floodplains. Ecoregion 78c is drier than the foothills of the Willamette Valley (3d) partly because the summer Pacific high pressure system arrives earlier and remains longer than in ecoregions to the north. Summers are hot and dry, and soils have a xeric moisture regime in contrast to the udic soils of the Mid-Coastal Sedimentary ecoregion (1g) to the west. Oregon white oak woodland, Douglas- fir, ponderosa pine, madrone, and an understory chaparral community cover the slopes and intermingle with pastureland, vineyards, orchards, and row crops.

— EPA

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Ecoregion