tldr: both roads are in good shape with more washboard on Barron
Depending on where you are heading there are two roads in the east, Barron Canyon and then Achray Road. The Achray road is a turn off from the main road. It is slightly shorter than Rock and very similar - both usually being in fine condition. The Barron Canyon road is slightly wider and the wash-boarding on it is wild. They seem to be grading it constantly but doesn't appear to make a difference. I haven't encountered too many logging trucks on the road but plenty of support vehicles that tend to drive the road at 100 mph. No potholes in the Barron canyon road (maybe due to all the grading), you see the odd one on Achray just like Rock. I've seen a black bear/s about 4 or 5 times on Barron and Achray in about a dozen trips. None on Rock in about 10 trips.