Northeast of Boise and west of Atlanta in the Boise National Forest, the Swanholm - Warrior Trail #051 is an 8 mile route that connects the Black Warrior and Horse Heaven Trails. It is part of the Black Warrior / Swanholm / Horse Heaven Trail System.
To reach the Horse Heaven Trailhead from the intersection of Quarts Rd. and Middle Fork Rd. in Atlanta, go west on Middle Fork Rd. for 15 miles. Turn right (north) on Alexander Flat Rd. (FR 327) and travel 6 miles to the trailhead on the right. This is the beginning of Horse Heaven trail. After 3 miles the trail intersects with Swanholm-Warrior trail.
Note: At the high saddle just before dropping into the Lakes basin, the trail gets steep and with sharp switchbacks and loose gravel making riding very difficult. Consider parking motorcycles here and hiking on if you want to continue.
Overall, Swanholm - Warrior Trail is the 41st most popular dirt bike trail of all 53 dirt biking rides in Idaho.