I'll back up Roy here, Stan. I wouldn't take my coach on what amounts to a logging road - NF33 stands for National Forest road 33. You can take Jerry's Flat up the south side of the river to Agness okay, and even stay at the nifty RV park there overlooking the Rogue, but beyond Agness I would not venture. It may look tempting, heck you may even get through it unscathed, but you'll likely use up time slowly negotiating mountain climbs, washboard, and curves, dust up a lot of components uneccessarily, and burn up a lot of fuel on slow low-geared climbs and hairpin curves you have to repeatedly accelerate out of; you might just as well take the longer but good highway 199 and spare yourself potential grief.
Joel