Grandpa, the Chehalis system is too supported by hatcheries. There's one at Lake Aberdeen, one on the Satsop, one on the Skookumchuck, one on the Humptulips (not on the Chehalis I know), one on the Wishkah (although it might not still be active) and I do believe all the major tribs are planted with smolts. In fact I think the Quinault tribe plants some of those tribs...