North 40 - with optional longer loop. UtahMountainBiking.com Ride Guide
The North 40 mountain bike trail is located within the Bar M loop just north of Moab. It forms a loop (with an optional short connector that converts to loop to figure-8) that's 4.2 miles long. The ride is early-intermediate technical. Of the rides in the area, it's harder than Lazy-EZ but much easier than Deadmans or Bar B.
Clockwise ride on North 40:
0.0   From valley parking, east on DT
        N38 39.106 W109 40.111
0.2   L on North 40 ST
        N38 39.200 W109 39.995
0.3   Keep L  for clockwise ride
        N38 39.263 W109 40.013
1.3   Keep L (R = crossover)
        N38 39.768 W109 40.608
2.3   Keep L (R = crossover)
        N38 39.774 W109 40.584		 3.7   Keep R (L = to Bar M, Circle O)
        N38 39.568 W109 39.975
        Keep R again at 3.8
4.4   L (loop finished)
        N38 39.263 W109 40.013
4.5   L on DT
        N38 39.106 W109 40.111
4.6   Back at parking
Clockwise loop North 40, Circle O, Rockin A, Deadmans (12 miles):
0.0   From valley parking, east on DT
        N38 39.106 W109 40.111
0.2   L on North 40 ST
        N38 39.200 W109 39.995
0.3   Keep L  for clockwise ride
        N38 39.263 W109 40.013
1.3   Keep L (R = crossover)
        N38 39.768 W109 40.608
2.3   Keep L (R = crossover)
        N38 39.774 W109 40.584
3.7   L and L on connector
        N38 39.568 W109 39.975
3.9   Cross Bar M N38 39.641 W109 39.861
4.1   L onto slickrock Circle O
        N38 39.713 W109 39.689
6.7   Continue to Rockin A (keep L)
        N38 39.166 W109 38.907		 8.5   Cross over to climb Bar B ST
        N38 38.272 W109 38.489
8.6   Keep R on Connector
        N38 38.261 W109 38.592
8.7   Keep R on Deadman's
        N38 38.253 W109 38.683
10.4 L onto EZ
        N38 38.573 W109 39.279
10.6 Keep R (north)
        N38 38.516 W109 39.403
11.8 L for TH (R = Lazy)
        N38 39.166 W109 39.856
11.9 L on DT downhill
        N38 39.187 W109 39.989
12.0 Back at parking

Getting there:
From I-70, drive south on US-191 for 22 miles. From Moab, drive 7 miles north from the Colorado River on 191. When you see the Gemini Bridges parking area on the west side of 191 (on the side with the cliffs), look for the Bar M gravel entry road on the opposite side (east, away from the cliffs). Turn onto the gravel road and immediately go right. Drive past the first restaurant parking area. Continue south to the spot where the fence separates the road from the paved bike trail and turn 90 degrees left. Descend to the new parking spot in the valley. Begin the ride by pedaling 0.2 miles east and find the North 40 trailhead on the left.
Copyright 2012 Mad Scientist Software Inc. Trail conditions change, and the layout of a trail may change without notice. Use this trail guide at your own risk.