Wow, I didn't even know there were any fall chinook that far north thats interesting.
The area your refering to has become quite trendy the last ten years and as a result many of the little side show activitys that we used to partake of when the rivers were out (sometimes for a week) have gone away with the crowds. Grouse hunting, beaver ponds for cutthroat, and just wandering around chatting with locals.
They made a five fold increase or more in the grouse license the cutties all got hammered and the locals aren't quite as friendly as they were when there were only a few of us.
Your best bet is to not let the rain fall good luck