The Mexican Mt Road starts at the Swinging Bridge North CG, goes past the BLM equestrian CG, then goes for 10 miles till road is blocked at Mexican Mt wilderness. Many nice free dispersed sites along this maintained but dusty road. Some sites down toward the San Rafael river in the bushes, others along the road or in side draws toward the cliffs. No designated sites, no water, no trash, no cell signal. As of now the BLM has no formal rule for portable toilets but that may change in future.