From the main parking lot, backup 100 yards on the road you came in on. The White Twister loop starts on the lower side of the road. Follow the trail and you will cross ridges and realize the trail name is appropriate. Just before the exit to the pay station, you will have some agressive climbs. From the top of the ridge you now go from the highest point on the trail to the lowest. Cross the bridge, go through the ferns, along root ridge and down to the old railroad bed. The last section travels an old railroad bed along Stonewall Creek. When the trail intersect with USFS Road #20, turn right and return to the parking lot.