I think he was asking about rivers, boys. Assuming that I'm reading that correctly, your closest choices are the clackamas and sandy. As you start driving further away, you get the Wilson, the Nehalem, the Mollala, and the Santiam. Pick one, drive down to it on a saturday, and look for cars. That'll tell you where the fishing spots are.

Check out www.ifish.net as well for more portland oriented info.