CM -
As you know to achieve that sort of reductions for Washington Salmon will require changes in the Pacific Salmon treaty. I believe the current treaty is in effect through 2018.

Even when the negations for the new treaty begin as always it will be very difficult to get two foreign countries (Canada and Alaska) to agree to back off Washington fish. In the short term the best hope for Washington stocks is for the survivals of those north stocks decline to the point that to prevent over fishing of local northern stocks fish rates on the feeding grounds will have drop significantly.