Got to go on a long flight with my son today. We went to Price for lunch then over the San Rafael swell to lake Powell and back to Moab. This is my reward for all the times driving him back and forth to civil air patrol meetings when he was little.
The road you are talking about is sandy but I don’t think you will have a problem getting back there. There is a gate at the back entrance by balance rock. I seem to remember the park saying that the back entrance is closed, but I could be wrong.