Area extends from the Columbia River up through the Mt. Hood National Forest and has served as an important emphasis for conservation and restoration efforts.
COA ID: 125
The Columbia Plateau ecoregion was shaped by cataclysmic floods and large deposits of wind-borne silt and sand earlier in its geological history. It is dominated by a rolling landscape of arid lowlands dissected by several important rivers, and extends from the eastern slopes of the Cascades Mountains, south and east from the Columbia River to the Blue Mountains.
The East Cascade ecoregion extends from the Cascade Mountains’ summit east to the warmer, drier high desert and down the length of the state. This ecoregion varies dramatically from its cool, moist border with the West Cascades ecoregion to its dry eastern border, where it meets sagebrush desert landscapes.
The West Cascades ecoregion extends from east of the Cascade Mountains summit to the foothills of the Willamette, Umpqua, and Rogue Valleys, and spans the entire length of the state of Oregon. It is largely dominated by conifer forests, moving into alpine parklands and dwarf shrubs at higher elevations.
Grasslands include a variety of upland grass-dominated habitats, such as upland prairies, coastal bluffs, and montane grasslands.
Late Successional Mixed Conifer Forests
Late successional mixed conifer forests provide a multi-layered tree canopy, including large-diameter trees, shade-tolerant tree species in the understory, and a high volume of dead wood, such as snags and logs.
Oak woodlands are characterized by an open canopy dominated by Oregon white oak.
Ponderosa Pine Woodlands
Ponderosa pine woodlands are dominated by ponderosa pine, but may also have lodgepole pine, western juniper, aspen, western larch, grand fir, Douglas-fir, mountain mahogany, incense cedar, sugar pine, or white fir, depending on ecoregion and site conditions. Their understories are variable combinations of shrubs, herbaceous plants, and grasses.
Flowing Water and Riparian Habitats
Flowing Water and Riparian Habitats include all naturally occurring flowing freshwater streams and rivers throughout Oregon as well as the adjacent riparian habitat.
Sagebrush habitats include all sagebrush steppe- and shrubland-dominated communities found east of the Cascade Mountains.
Wetlands are covered with water during all or part of the year. Permanently wet habitats include backwater sloughs, oxbow lakes, and marshes, while seasonally wet habitats include seasonal ponds, vernal pools, and wet prairies.
American Marten (Observed)
American Pika (Modeled Habitat)
American Three-toed Woodpecker (Observed)
American White Pelican (Observed)
Black-backed Woodpecker (Observed)
Brewer’s Sparrow (Modeled Habitat)
Spizella breweri breweri
California Mountain Kingsnake (Observed)
California Myotis (Observed)
Cascade Torrent Salamander (Modeled Habitat)
Cascades Frog (Observed)
Caspian Tern (Observed)
Chinook Salmon (Documented)
Coastal Tailed Frog (Modeled Habitat)
Coho Salmon (Documented)
Common Nighthawk (Modeled Habitat)
Cope’s Giant Salamander (Observed)
Crater Lake Tightcoil (Observed)
Ferruginous Hawk (Observed)
Flammulated Owl (Observed)
Grasshopper Sparrow (Observed)
Ammodramus savannarum perpallidus
Great Basin Redband Trout (Documented)
Oncorhynchus mykiss newberrii
Great Gray Owl (Observed)
Harlequin Duck (Modeled Habitat)
Hoary Bat (Observed)
Lewis’s Woodpecker (Observed)
Loggerhead Shrike (Observed)
Long-legged Myotis (Observed)
Northern Goshawk (Observed)
Accipiter gentilis atricapillus
Northern Sagebrush Lizard (Modeled Habitat)
Sceloporus graciosus graciosus
Northern Spotted Owl (Observed)
Strix occidentalis caurina
Olive-sided Flycatcher (Observed)
Oregon Slender Salamander (Observed)
Oregon Spotted Frog (Observed)
Pallid Bat (Observed)
Red-necked Grebe (Observed)
Silver-haired Bat (Observed)
Steelhead / Rainbow / Redband Trout (Documented)
Oncorhynchus mykiss ssp
Swainson’s Hawk (Observed)
Townsend’s Big-eared Bat (Observed)
Trumpeter Swan (Observed)
Western Painted Turtle (Modeled Habitat)
Chrysemys picta bellii
Western Pond Turtle (Observed)
Western Toad (Modeled Habitat)
White-headed Woodpecker (Observed)