I am going to do the rouge also at the end of the month and also looking for some good side trips for the way down and back up..
the white salmon was definately on the list even though it is out of the way.
the clackamus isnt that far off I-5. awesome whitewater and good flows right now!
also i heard that the molalla might be a good 3/4 run, i might be forgetting the name though, it is not in the bennet boook. i heard about it from the next adventure guys in portland.
if you have any other ideas, in the 3/4 range i would be interested to.
have a good trip, I would be stooked to hear a trip report about the rouge at these high flows