Posey Lake - Hell's Backbone Road (Utah FR 153)

That's a good two lane road all the way thru the Hell's Backbone Bridge and on to Boulder. We were in Escalante a few weeks ago but did not go that way. We have never been to Posey Lake tho so I'm not sure what the feeder road is like, but generally Utah has good secondary roads.
We have spent several weeks in the Escalante area over the years. The lower Box Canyon trailhead is near there and is a nice trail and of course there is Hole in the Rock road which we've been down several times.