- Species Common Name Winter Steelhead / Coastal Rainbow Trout
- Species Scientific Name Oncorhynchus mykiss / Oncorhynchus mykiss irideus
- Federal Listing Status Threatened
- State Listing Status Sensitive
- SMU/ESU/DPS/Subspecies Willamette SMU, Upper Willamette River ESU
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.
The Willamette Valley ecoregion is bounded on the west by the Coast Range and on the east by the Cascade Range. This long mostly level alluvial plain has some scattered areas of low basalt, and contrasts with productive farmland and large urban areas. It has the fastest-growing human population in the state resulting in challenges due to land-use changes.