On my round trip (Warburton - Reefton Spur - Marysville - Black Spur) today I made a little detour up to Mt Donna Buang, given how the fog was trapped in the valleys this morning. On some parts of the road they must have had landslips recently. While they are cleared (on one spot was a part of a tree blocking part of the road - road hazzard sign gave warning), it has left quite a bit of soil and muck on the road. Other parts are great though. Just ride carefully if you're thinking of going up there soon.