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The level III ecoregions in Oregon are the Coast Range (1), Willamette Valley (3), Cascades (4), Eastern Cascades Slopes and Foothills (9), Columbia Plateau (10), Blue Mountains (11), Snake River Plain (12), Klamath Mountains (78), and Northern Basin and Range (80). (Compare to map of Level IV ecoregions.)
The region is characterized by Oregon white oak woodlands and ponderosa pine forests in the east and Douglas-fir and western hemlock forests in the west. Some grasslands also occur. Understory plants include Idaho fescue, bluebunch wheatgrass, antelope bitterbrush, Oregon grape, hazel, and snowberry.
The Willamette Valley ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency in the U.S. states of Oregon and Washington.Slightly larger than the Willamette Valley for which it is named, the ecoregion contains fluvial terraces and floodplains of the Willamette River system, scattered hills, buttes, and adjacent foothills.
List of ecoregions in Oregon; B. Blue Mountains (ecoregion) C. Cascades (ecoregion) Coast Range (EPA ecoregion) Columbia Plateau (ecoregion) E.
The Blue Mountains ecoregion has been subdivided into fourteen Level IV ecoregions, as described below. The EPA has not yet published an Ecoregions of Washington poster similar to the informational posters for Oregon and Idaho, and the Washington information presented here is not as complete as the information about the other two states.
The Cascades is bordered on the north by the North Cascades ecoregion, on the south by the Klamath Mountains ecoregion, on the east by the Eastern Cascades Slopes and Foothills, and on the west by the Willamette Valley and Puget Lowland ecoregions. It been subdivided into six Level IV ecoregions in Washington and Oregon, as described below ...
[1] [3] Level IV is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States. For an example of Level IV data, see List of ecoregions in Oregon and the associated articles.
Western Oregon: West of the Cascades, Lane County and north Portland, Salem, Eugene: 3,010,021 (2015 est.) [1] Minimal definition. Sometimes includes Southern Oregon. Area on the map highlighted in blue. Applegate Valley: Southwestern Jackson and eastern Josephine counties along the Applegate River: Applegate, Ruch: Not available Cascade Range ...