Alder Creek kayak shop is always a good place to start. The classics list includes is too long to do justice too but ones that I have done. Canyon Creek(washington), White Salmon - Green Truss, Little White Salmon(Burley), Grays river (washington coast range), East fork of the Lewis(easiest listed). You will be in the thick of it. The first four are highly recommended and within an hour and a half of Portland.
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