Be aware that Sheldon Trailhead is foremost a horse trailhead and used by horseback riders a lot. The horses have the right-of-way and courtesy is foremost. NO motorized travel allowed at all. The backcountry horse group and a few individuals keep these trails cleared and open.
Singletrack trail begins at the radio repeater on Sheldon Mountain, just outside of Libby, MT. The upper portion of the trail follows classic singletrack through ponderosa pines. Several tight, slightly-banked switchbacks dot the trail. Eventually, the trail pops out on Michael's Draw. Turn right and follow the road approximately .3 miles to the signed trail marker. Turn left for the most fun portion of the ride.
The second section is a bit more up-and-down, but includes a lot of great features (small jumps, whoops, switchbacks, etc.). Two steeper sections round out the end of the ride. The trail ends on Sheldon Flats Rd.