From Pine Ridge campground access the trail at the trailhead just across the park road from the restrooms. The trail is single track starting out but after a few miles there is a mix of singletrack, doubletrack, and gravel roads to complete the loop. Many sections have heavy damage from horse use. There are reroutes and new trail planned for the near future.
From Ashland take Y east of town across Hwy 63. Look for the Pine Ridge Campground a mile or two after crossing Cedar Creek. From New Bloomfield take MM west of town a short distance and turn right (north) on J. Follow J to the small town of Guthrie and turn left (west) at Y. Pine Ridge campground is a few miles down Y on the right.
http://www.singletracks.com/item.php?c=1&i=4979