jhweyen, be more specific as to what kind of trip you want to get on. Are you looking for multi day raft supported wilderness or steep creeking, car camping day trips? You have landed on a good resource to find either, but your post is vague and may not result in much response.
The mountainbuzz forum is predominantly used by Coloradoans, although it is becoming bigger and wider, as I have recently noticed a handful of post s from Europe as well as more and more posts outside of CO.
As of today, CO is WAY behind in snowpack. The states you mentioned of Idaho and Oregon are likley to have much better water. That being said, there may be some good creeking in CO in late May that otherwise would flow later.
Pray for more sonw.