Fishery managers from Oregon and Washington have set spring Chinook salmon seasons for the Columbia River.  Above Bonneville Dam, state fishery managers approved a Chinook retention season starting on March 16 and continuing through May 6 with an expected recreational harvest of 900 fish.  The recreational springer season on the Columbia from the river mouth upstream to Bonneville Dam will be open from March 1 to April 9, with two days off during that period to allow for potential commercial fishing periods.  The Columbia River spring Chinook season is based on a forecast of 299,200 returning spring Chinook, which includes an expected 188,800 upriver spring Chinook.  The prediction is down from last year’s banner return of 415,200 springers but above the 10-year average return of 285,000 fish.