As the planet warms, Idaho’s high-elevation streams may remain cold enough for spring chinook salmon, but lower flows will reduce the abundance and quality of spawning and rearing habitat, according to a soon-to-be-published study.

Snowpack-dependent flows have already dropped about 20% from levels recorded in the late 1950s. That decreased spawning habitat by about 10%. Flow velocity is down 17% and side channel habitat declined 6%.