UT 308, in Kodachrome Basin SP near Cannonville, is not in the HB. Based on a post over in AARoads, I found
GMSV imagery showing that the route is signed, at least at one end. If it was left out of the HB as unsigned, now it's signed, and can go in.
I looked at the thread for usaut over in the CHM forum, no mention of UT 308 or why it wasn't included.