If you are only interested in trout then maybe you should look to the Klamath River, or Klamath Lake. Otherwise, you might look into fishing the Rogue for some "half pounders" steelhead, which are usually pretty prevalent. I'm pretty new to Oregon and have been concentrating on the North and South Umpqua which is concidered southern Oregon but a bit farther north and not generally known for trout.
Good luck.
Gary