Some Populations are Stable, While Others Fluctuate
The Snake River region contains 12 demographically independent populations of salmon, steelhead, and bull trout. Five of these populations have sufficient data to measure, and two, Asotin Creek and Joseph Creek summer steelhead, are exhibiting numbers above the recovery goal. Overall, populations of middle Columbia River steelhead within Washington have been declining recently after promising increases bringing them closer to meeting delisting criteria for adult abundance. Distribution remains a significant challenge for the Walla Walla population because of fish barriers in Mill Creek.
Populations of spring/summer Chinook are stable, and fall Chinook salmon are on the rise and recently have exceeded recovery goals. The number of adult Snake River steelhead varies but overall is stable – Tucannon River steelhead are below the recovery target, Asotin River and Joseph Creek steelhead are above the target, and insufficient data exist for the Grande Ronde River.