Tillamook Bay is the home of some of the largest fall Chinook salmon that return on the Oregon Coast. With five rivers coming into Tillamook Bay (Wilson River, Trask River, Kilchis River, Miami River and the Tillamook River), you can understand why the salmon returns are so robust. The fall Chinook salmon return on Tillamook Bay also runs for an extended time period. Fall salmon return to Tillamook Bay from late August through mid-December, with Chinook salmon occasionally eclipsing 35 pounds in weight.