If you are already in Rogue country, it is going to be hard to exceed what you could do close to home. Where are you, around Grantville?
One of the closest public cold water fisheries that comes to mind is the Sandy River. But I don't know if there are summer steelies in there now. After that, I suppose the drive to the Big D around the Maupin area would be worthwhile. July is caddis season and is a fun time to fish there, but it's a little early and you'd need to check on the status. With only 8 hours, you'd be pushed pretty hard for time to do a Maupin trip.
I have to take a call, let me finish this later. Depending on the run, it might be a time to catch some salmon in the Columbia.