This is the largest COA within the Columbia Plateau Ecoregion extending from Rock Creek to Butter Creek, totaling 809 square miles.
COA ID: 155
Located in NE Oregon, the Blue Mountains ecoregion is the largest ecoregion in the state. It provides a diverse complex of mountain ranges, valleys, and plateaus that extend beyond Oregon into the states of Idaho and Washington.
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.
Grasslands include a variety of upland grass-dominated habitats, such as upland prairies, coastal bluffs, and montane grasslands.
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.
Brewer’s Sparrow (Observed)
Spizella breweri breweri
Bull Trout (Documented)
Burrowing Owl (Modeled Habitat)
Athene cunicularia hypugaea
Common Nighthawk (Observed)
Ferruginous Hawk (Observed)
Grasshopper Sparrow (Observed)
Ammodramus savannarum perpallidus
Hoary Bat (Observed)
Lawrence’s Milkvetch (Observed)
Astragalus collinus var. laurentii
Lewis’s Woodpecker (Observed)
Loggerhead Shrike (Observed)
Long-billed Curlew (Observed)
Northern Sagebrush Lizard (Modeled Habitat)
Sceloporus graciosus graciosus
Pallid Bat (Modeled Habitat)
Sagebrush Sparrow (Observed)
Silver-haired Bat (Observed)
Steelhead / Rainbow / Redband Trout (Documented)
Oncorhynchus mykiss ssp
Swainson’s Hawk (Observed)
Washington Ground Squirrel (Observed)
Western Painted Turtle (Modeled Habitat)
Chrysemys picta bellii