did you go to the end? I heard that it went 8 miles up there... not sure I believe that, but I'm going to ride it soon and will report back.
where I was riding today was on the other side of the road on the Kanc, up between Sabaday Falls & Champhey Falls. I was on some logging/forest roads that went probably 3 miles up into the hills. from there you could see some clearcuts across the road that were higher that we were. obviously there must be logging roads up there, but I don't know where they start - perhaps off Rob Brook somewhere. based on that I wouldn't be too surprised if that road went uo several miles.