Given where your staying on the NU, a trip to Joe Howell's "Blue Herron" fly shop is a MUST ... just leave your wallet back at camp.
Joe's been at the same location for well OVER 20 years and is on a first name basis with each and every rock.
Don't know if your intent is to get as far down (south on I-5) as the Rogue, but that's my 'home waters.' If that's in your game plan, by August there are lots of summer runs, especially in the Grants Pass area. Lots of public access, etc.
If you'd like further info send me a e-mail/phone number and I'd be happy to give you a who, what, where, and when. One other phone number you'll want is the fish count figures from Gold Ray damn located just north of Medford. 800 472 2434
This will give you the numbers into just the top 30 miles of the Rogue.
Forgot to ask: are you 'camping,' or in a motor home? Ask, as there are a few great places to stay (Valley of the Rogue Park, etc.) that are right on the river and have good access to water worth fishing at their door-step.