Cowlitz, Kalama, & Lewis (North to South) are probably the places you will see more fishermen and can accelerate your learning. There are others, but I won't share them here.

These 3 are great fishing rivers & great catching rivers.
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"You're not a g*dda*n looney Martini, you're a fisherman"

R.P. McMurphy - One Flew Over The Cuckoo's Nest