Columbia River Redband Trout

Oncorhynchus mykiss gairdneri

Predicted Distribution Loss by End-of-Century:
27%

MT Conservation Rank:
S1 (Critically Imperiled)

Synopsis: Columbia River Redband Trout are widespread across the Pacific Northwest, but populations in Montana (native to the Kootenai River basin below Libby Dam) are highly introgressed with Coastal Rainbow Trout and, to a lesser degree, Cutthroat Trout. Unhybridized populations are mostly isolated to headwater streams above waterfalls. It is not clear whether warming temperatures are contributing to further hybridization. Substantial management effort is ongoing for the species.