100% Single track in a figure-eight loop with a two-way crossing separating the east and west sections. The trail is almost all narrow, rocky, technical terrain with a few hike-a-bike sections on the more difficult rock faces. Estimate an hour and change. VERY technical rocky sections throughout course. Do the East loop for a tryout. It's still very difficult, but not quite as technical as the rest of the course. You can access this in the parking area that you first see as you enter the park (up the dirt road a few hundred feet and take a left around the Pine tree).
Highway 183 from either the north (I-40 at Clinton) or the south (Highway 62 between Lawton and Altus). Just a couple of miles north of Snyder there is a large wooden sign (pic below looking South) clearly visible on the west side of 183 for Lake Steed & Great Plains State Park.
http://www.singletracks.com/item.php?c=1&i=1394