West Fork of the San Juan is 5-ish. That's a scout and use your own judgement deal. I don't know enough people that have run it, and I've only done it once. There were a few places I decided to walk because it was late and didn't want to risk it. A few Durango boaters might have better beta. Wolk Creek is the Everest of Colorado in my view, and might not even be do-able without turning it into a portage fest, and a difficult one at that. That's why I was trying to get some beta on the whole area. Sounds like there are a few goodies that don't get much traffic.