In the Caribou - Targhee National Forest, the Sheep Driveway Trail #51 is a 28.5 mile route open to dirt bike riding. The entire route is open to offroad motorcycle riding, but only the first 5 miles are open to ATV riding.
To reach the trailhead from the intersecion of I-15 Business and US 26 in Idaho Falls, go north/east on US 26. Travel 21 miles to a left (north) on 175 Rd. E. Go 3 miles, travelling through the town of Poplar. Take a right on E. Heise Rd. This road goes through the town of Heise. Travel just over 2 miles and stay left on Kelly Canyon Rd. Go 3.5 miles to a left on 218 Rd. Travel 1.8 miles and turn right on Long Hollow Rd. (218.) Go 8.2 miles to a right on 226 Rd. Travel 3 mils to where the 226 Rd. intersects with Hilton Creek. This is the spot for ATVs to pick up the trail.