I have not yet fished the rivers in a prop boat, but I know that there are alot that do. Like at the lower Duwamish. Fisherman troll plugs as far up river as to where the post office warehouse is. I also have a friend that hunts duck on the tide flats of a couple of river north of Seattle. So the answer, I believe would be Yes. Just be aware of your surroundings.
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If I caught a fish I would be a catcherman.