Mustang Loop
The Mustang Loop lies along Highway 313 northwest of Moab. It's part of the Horsethief Area trail system built in 2015, and is the key to the mountain bike riding area. The loop's top altitude is 5950 feet, with a usual riding season of April through November. The loop is intermediate in technical requirement. The loop itself is 3 miles in length and is reached via connecting trails.
Trail conditions, connections, and alignments will change. Use this guide at your own risk. 2015 UtahMountainBiking.com
Riding notes, Mustang Loop clockwise from Chisholm:
0.0   East from 313 (Chisholm) TH
N38 34.866 W109 47.857
0.5   L on Mustang Loop
N38 35.088 W109 47.586
1.3   Keep R (L = Whirlwind  joins)
N38 35.501 W109 47.388
1.4   Keep R (L = Whirlwind leaves)
N38 35.499 W109 47.308
2.7   Keep R (L = toward Getaway)
N38 34.909 W109 47.267
3.3   L on Chisholm N38 35.088 W109 47.586
3.8   Back at parking
Getting there: From I-70 and Crescent Junction, drive south on US-191 for 20 miles (about 9 miles north of the Colorado River if you're driving out from Moab) to Highway 313. Drive uphill 11 miles.
Horsethief Campground: On your left at mile 11.8 from Highway 191. Use this trailhead only if you're camping. There is no general trailhead parking here. After claiming your camp spot, pedal to the east end of the eastern camping loop and fork south on the Chisholm Trail.
Highway 313 (Chisholm) Trailhead: At mile 12.5, spot the trailhead kiosk on the left side of the road. Turn into parking. Pedal east (away from the highway) on Chisholm to intercept the Mustang Loop in 0.5 mile.
Gemini Bridges Road (Getaway) Trailhead: For longer rides of the area trails. At mile 12.9, turn left at the Gemini Bridges sign. About 200 feet from the pavement, spot a small parking area on your left with the Getaway Trail just east of parking. Mustang forks away from Getaway 0.6 miles from the trailhead.
Bull Run Trailhead: Drive 1.1 miles down the Gemini Bridges dirt road, then turn right into the trailhead. Start your ride to the Horsethief Area trails by heading left on 7up.