I did it in Sep 2012 on a Cross bike with 32x700 tires. Not a bad ride. The gravel road is a little rough on the descent. There is a cool waterfall toward the end of the descent. The road was a little dusty at that time so the 3 cars that passed by dusted us up a bit. The country store in Dora isn't open anymore so no food until Myrtle Point.
We did lunch at the Myrtle Point A&W Drive-IN. After some cheeseburgers and root beer floats my riding partner decided he'd had enough gravel so we road HWY42 back to the Roseburg area.
I hope to do the burnt ridge ride this summer.
Here is the starva data for my ride.
Bike Ride Profile | 98 miles near Roseburg | Times and Records | Strava