Wolverton is a singletrack just above the Pipeline.  You can access it from Hardscrabble road.  If you are looking for a good climb, start at Mayer Gulch or Turniphead and climb to the Arroyo Gulch parking area (or start here) and do Pipeline up.  As you can see below, when you come off Pipeline, you will ride on Hardscrabble road through two switchbacks and then turn off on your left.  There are two big boulders that are sitting in front of the trail start that prevents jeeps from accessing it, but it is still open to dirt bikers.  This trail crosses the creek again and climbs even more, right at the beginning and a just past the half way point.  Wolverton is a nice loop (approximately 4 miles) that is almost all in the aspen trees.

Screenshot 2015-06-01 09.18.23 Screenshot 2015-06-01 09.15.05