Bull Trout, Walla Walla SMU Photo Credit: Terry Smith, U. S. Forest Service Overview Species Common Name Bull Trout Species Scientific Name Salvelinus confluentus Federal Listing Status Threatened State Listing Status Sensitive SMU/ESU/DPS/Subspecies Walla Walla SMU Ecoregions Blue Mountains 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. Special needs Requires cool temperatures for spawning and rearing. Requires channel complexity and available migratory corridors. Limiting factors Passage barriers. Habitat. Data gaps Long-term monitoring method. Conservation actions Continue habitat restoration. Screening.