This ride is also known as Courthouse Wash. It's a big loop that includes a section of paved trail, some old broken-down highway, some ATV track, a tiny section of singletrack, a section of rocky roadway, and finally, paved road in Arches National Park. It's a substantial chunk of riding. Nothing too hard, but a long 28 miles. Absolute altitude change is 1000 feet; with ups and downs, you'll climb 2300.
At the north end of Bar M, Seven Mile Canyon will yawn open to your right. As the trail turns west (toward the highway) catch a doubletrack northeast across the wash. You're riding along the pipeline route.
The pipeline will drop abruptly just above the Sovereign Singletrack trailhead. The trail will fork. Left is a more technical singletrack route. Right is ATV-width tread and much easier. The trails reconnect, then head north to Willow Springs Road. Turn right (east) on the road way and head towards Arches.
Bar-M turnoff N 38° 38.444' W 109° 39.462'
Bar-M turn-north N 38° 38.311' W 109° 38.500'
Pipeline to Willow Springs N 38° 41.920' W 109° 39.754'
Arrive Balanced Rock N 38° 42.121' W 109° 34.029'
From Moab, drive north (toward the Colorado River). Cross the Colorado, then cross the Courthouse Wash bridge. About 1/4 mile later, turn right into a parking area. This is the trailhead. GPS N 38° 34.945' W 109° 30.587'. Start uphill on the paved bike trail.
Riding resources for the arches loop:
Large-format topo map (3 MB): View to print
GPS track files (right-click and "Save as...":
GPX loop ride
Single-page riding guide.
Lodging, camping, shops: Links to Moab area resources