Drive east of Green River on I-70 about 40 miles to exit 202. Take highway 128 east for 2.8 miles to an intersection. Go right on highway 128 for 7.2 miles to Dewey Bridge. Just before the bridge crosses the river, a dirt road goes to the right. A few hundred yards further is a gate. Beyond this you will need a high clearance vehicle. There is plenty of agate within walking distance of the gate.