As I remember it is not well marked if at all. Once you pass the turn of for Hite You will next pass Farley road,white Canyon road then it will be the second right after that. Google maps are an excellent way to see this area. You can trace yourself directly from the road to the water.
We took that road third week of May with a 16ft single axle trailer- drug the tougne of the hitch into the dirt in a few places- the biggest problem is to meet another trailered boat - no room to get passed on the switchbacks- won,t do it again