This is a nice long trail with some pretty technical climbs and rooty portions that seem to lend itself to late season riding. The trail is long. The trail has a relatively flat middle section (between the spillway/dam and group campground) that has a lot of switchbacks. In the height of summer, sight distance might be pretty limited. Thorn Mtb trail is one way, but portions of it share access with other users, so pay attention. Also, the locations where the trails run together are not marked very clearly. The park entrance isn't marked very well, if you see the "park office" sign, turn there, make a right at the 3-way intersection, and the trailhead is on your left.