I've used a prop pn some of the larger rivers like the Snohomish, Chehalis, Lower Stilly, Lower Skagit and Cowlitz (although that river is kinda iffy). The lower parts of large rivers a fine aslong as you keep you eyes open.

I wouldn't do the Sky.
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They say that the man that gets a Ph.D. is the smart one. But I think that the man that learns how to get paid to fish is the smarter one.