A great trail. Starts off with a downhill that you wouldn't expect from a trail in the Chicago area, then switches to up and downs. A couple river crossing(very deep when wet) and very tight singletrack near the river where it is easy to fall (only a couple feet). Some technical sections like the stream crossings, and some side trails that you'll have a hard time riding down (make shure you stay on the legal trails though). 5/5 considering the area it's in.
Traveling north on waukegan, turn right on voltz road, go over the tracks and turn left on grant road. Park at the turn/ gravel area.
http://www.singletracks.com/item.php?c=1&i=3850