The official Nephi's Twist trail is a doubletrack heading up a wash from La Verkin Creek to the Moenkopi Trail. It's about 1.5 miles long, and has a ridiculously steep section near the upper end. If you're doing the official ride, I'd suggest downhill only, or do it as an out-and-back from the bottom doing only the first 0.8 mile.
Qualifier Number 2: This trail is for REAL experts only. Seriously. And if heights make you nervous, you have no business on this trail. The path sits on a fin of Moenkopi shale, breaking away quickly on each side with cliff-like steepness.
From the shooting range sign (about 150 yards from SR-9), head north on the doubletrack. As you dip through a tiny wash, a DT forks left. Keep right. After 1/10 mile, keep right at another fork. (These two left forks join after 1/10 mile and plunge down to the Nephi's Twist doubletrack trailhead. You'll be on that DT once you've ridden the ridge.)
At mile 0.4, fork left off the Moenkopi trail. Angle gently uphill on the DT heading west. As the trail comes over a rise and turns a little to the right, look for singletrack on your left. (The singletrack was hidden in the brush, totally invisible.) This ST will head south to circle around the south side of the small knoll.The narrowest parts of the ridgeline are spooky-thin. Not enough room to walk alongside a bike. There's a good chance that, if you stop and put a foot down, the foot will land on air and you'll tumble.
When you hit the doubletrack, you can turn left and head uphill for another loop. There's a very steep section of 15% grade for 0.1 mile. For most of us, this will be a push-a-bike.
0.0 From the shooting range sign, head north on DT
Immediately keep R N37 13.683 W113 15.188
(L=DT to bottom)
0.2 Keep R N37 13.793 W113 15.212 (L=alternate to downhill DT)
0.4 Fork L off Moenkopi on DT N37 13.950 W113 15.222
0.7 At high point of DT, find trail on left N37 14.048 W113 15.495
(Trail will wrap around to the south side of the small knoll)
1.1 South (L) on ridge N37 13.955 W113 15.770
(Option: steep plunge R to alternates
split at N37 13.938 W113 15.806)
1.2 Option L on ridge vs R down then L N37 13.897 W113 15.751
(Or R uphill toward alternates)
1.3 In wash bottom heading south N37 13.857 W113 15.791
(Option L uphill for loop, or to return to upper TH)
2.0 Fork L N37 13.799 W113 15.380
2.1 L for another loop N37 13.793 W113 15.212
R to return to car at shooting range
1.5 Keep R downhill N37 13.753 W113 15.956 (L=to water tank)
1.7 Keep R downhill N37 13.744 W113 16.139
(L= to subdivision roads)
2.1 At bottom TH N37 13.893 W113 16.428, turn L
Stay L on paved roads until you reach SR-17 at 2.9
3.9 Traffic light, L on SR-9
5.7 L into parking area
5.8 Back at car
From I-15, take either the Toquerville (if southbound) or Hurricane (if coming up from St George) exits. Go to La Verkin. At the traffic light where Highway 9 meets Highway 17, head east (toward Zion National Park). Exactly 1.7 miles after the light, you'll crest the top of the bluff. Immediately look for the dirt road on the left. Drive 0.1 mile to a broad dirt area. (In 12/10, there was a shooting club sign.) Park here, N37 13.663 W113 15.145. The trail is the dirt doubletrack heading straight north (on the left side of the parking area).
Single-page riding guide: View
GPS track files (right-click and "Save as..."):
GPX Wider-area topo map for printing: View
Lodging, camping, shops: Links to St. George area resources