Got back this weekend. We stopped into fish for an afternoon on the Rogue above the lake. Just picked a campground and worked the stream up and down river. Was able to get into plenty of rainbows (guessing they were stocked fish) in the 8-12" range. The water was indeed quite cold. I was wet wading and was wishing I had waders. My boys said it was colder than Crater Lake and based off how quickly they got out of the water I believe them. The fish were holding in slower deeper pools. I got all my fish nymphing (jiggy pats and a prince nymph). Beautiful river to fish on!! Thanks again to everyone for the advice.