Chinook spawn in rivers along the BC coast and far inland up the Fraser. COSEWIC’s 2018 assessment split southern British Columbia’s chinook into many separate populations, or designatable units, from the lower Fraser to the North Thompson and the upper Fraser, and on the east coast of Vancouver Island.
The upper Columbia, before and after
The Northwest Power and Conservation Council describes the Columbia in British Columbia as historically a salmon river. Mongabay’s 2026 report explains what changed: Grand Coulee Dam in Washington, finished in 1938 without fish passage, blocked salmon from more than half the river’s length and from spawning grounds and nursery lakes in Canada. Chief Joseph Dam followed in 1955. In Canada, Hugh Keenleyside, Mica and Revelstoke dams were also built without fish passage.
The same report covers the First Nations-led work to bring salmon back. Tribes in the United States have released adult chinook above Grand Coulee, and a small number have been tracked moving into Canada, some as far as the first major dam. The report notes that chinook will be harder to restore than sockeye. None of this is a fishery on the
Columbia River today.