- Species Common Name Summer Steelhead / Columbia Basin Redband Trout
- Species Scientific Name Oncorhynchus mykiss / Oncorhynchus mykiss gairdneri
- Federal Listing Status Threatened
- State Listing Status Sensitive
- SMU/ESU/DPS/Subspecies Mid Columbia SMU, Middle Columbia River ESU
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.
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.