Wasn't there a family in a Motor Home stranded in this area within the last year? I think they were out of Medford and they were headed to Brookings. It seems they took a back road as you described and a couple of them finally walked out...
First of all, I know nothing of this area, but if I was looking at a map and I was leaving Roseburg for Gold Beach, I might take that road through Riddle, Glendale, to Galice,Agness, then to 101 and to Gold Beach. The link doesn't say what # road that is.
I mean Riddle to Galice...forget Glendale. I think that's on another road.