This is the network for all the portland boaters and those from hood river, and many others as well. probably your best bet.
Click on Forum, and you will then see links for Eugene kayaking forum and Bend kayaking forum. I have had luck meeting many cool boaters here in this area just as I have with the buzz in the 'rado. Also any beta you need about a run. Definitely buy a copy of Soggy Sneakers for all the runs; it's OR's version of "the Bible," with as much info but not nearly as cool.
Oh, forgot to mention, you'll have to have a yahoo account to use the forum, but this is really easy to do, and your account doesn't expire with non-use as hotmail used to.
email if you're in the area and want to meet for a run.