It's been so long since I've hunted ducks I can't really help you out on where to go, other than I'd have to say the Chehalis River ought to be as good as any. I wonder how many ducks will be on the rivers though, with all this rain there ought to be plenty of other places for them to go. The only time we did good on the rivers was early in the season when there wasn't water anywhere else, or later in the season when everything froze up except for the rivers. But, it's worth a try anyway, you might find a few, and there could still be a few wood ducks around too.