Are you accustomed to flatter spring creeks? Water in the Coast Range is usually moving down a pretty good incline. That spot should at least be a little warmer than the McKenzie River, on the other side of Eugene. It has some seriously violent whitewater, deep, with big rocks, and snowmelt water that hurts me to think about getting thrown into. Good place to fish, though.
All of my experience is in the Southeast: Pigeon River and Nolichucky River in Tennessee (plus various creeks/small rivers as a kid), Ocoee River in Tennessee/Georgia and Chattahoochee River. I’d love to do the Chattooga before I’m too old, but haven’t made it there yet. I have always had a special love for the Nolichucky, but the Ocoee is most popular, I guess.
Maybe when I go out West next year I can try some of your cool rivers. Not sure I’ll make it up to Oregon and Washington, though. I’d originally planned on it to visit relatives there, but they are all moving to Texas. Still would like to go anyway. The McKenzie sounds beautiful, but may be out of my league now I’m getting older :( Thanks for the warning!