DistributionRead full entry
Range DescriptionColumbia River drainage in northern Oregon, Idaho, Montana, and Washington; Nass (Pacific Slope) and Peace (Arctic basin) river systems in British Columbia; Vancouver Island and other islands off the coast of British Columbia; common, locally abundant (Lee et al. 1980, Wydoski and Whitney 1979, Page and Burr 1991). Lee et al. (1980) mentioned occurrence in Athabasca River, Alberta, but did not map this locality; Page and Burr (1991) did not indicate the occurrence of this species in Alberta.