East of Markleeville in the Humboldt-Toiyabe National Forest, the Barney Riley Trail (aka Leviathan Trail) is open to OHV users. The route runs 10 miles to the Carson River. The original Barney Riley Trail route took off from the south side of Hangmans Bridge. The bridge is located where HWY 89 crosses the Carson River. That route was closed many years ago to vehicle traffic. You now must enter from HWY 89 or Monitor Pass on FS190, or Loope Canyon Road. There are several different routes you can take.
To reach the Barney Riley Trail trailhead from Markleeville, go south on SR 89 for 5 miles. Veer east and stay on SR 89 for 1.7 more miles. Turn left onto Loope Canyon Road (FR 190). Then follow FS190 to FS190B to FS310. It is important to take a detailed map -- many of the roads are not signed.
Note: on the trail map, the dotted lines are jeep trails.
Overall, Barney Riley Trail is the 44th most popular OHV & 4wd jeep trail of all 102 OHV routes in California.