3-corners area huh..
if your coming south on 191, about 100 yards before you get into Utah there is a road on the left saying Clay Basin and/or Jarve ranch, go thru the gas fields and down a steep canyon and you arrive at Brown's Hole. it is about 15 miles from 191.
when you get there if you turn left you go to Colorado, turn right you go to Jarve ranch, indian crossing, and 2 camp grounds with a boat ramp....
watch out for the big bull Moose that walks the banks of the green river as he would just assume stomp you as look at you.
South Mountain is across the river in the Diamond Mnt unit