East of Nevada City in the Tahoe National Forest, the Burlington Ridge Trail Complex is open to horseback riding. The trail has several loop options and each are blazed with colored markers (some blazes may be missing). These trails are used by offroad motorcycles, so use care, especially near the Chalk Bluff Road Trailhead on the eastern end of the complex. Equestrians tend to prefer the Washington Overlook Trailhead on the western end of the complex.
To reach the trailhead from Nevada City, head east on SR49 for 12.5 miles. Turn right heading southwest on Road #20-9 to the Washington Overlook Trailhead. Follow the gravel road over 0.5 mile to a large, dirt parking area permitting parking of trailers as well as room to turn around. Next to Highway 20 is a gate that is locked November 1-May 15. At the gate two or three small vehicles could park for mountain biking or hiking in the off-season.
Here are the loop options:
Hallelujah (red): 2.3 miles, difficult
Towle Mill Loop (blue): 9.4 miles, moderate
Omega (orange): 4.4 miles, difficult
Stanton (purple): 2.2 miles, moderate
Big Tunnel (black): 0.7 miles, difficult.