It's been more than 15 years since Jp has wheeled 21 Road in Grand Junction, Colorado ("Colorado's New 21 Road," Dec. and Jan. '98).
Now, 21 Road might sound kind of odd, but that is the way many roads in and around Grand Junction, Colorado, are named. Rather than First St., they've got things like 16 Road or 21 Road. The trail itself is only about 1.6 miles, but it starts about 11 miles after the pavement on 21 Road stops. Once you get there, the trail forks off the graded dirt 21 Road and continues up into the mountain. While the trail has a reputation as possibly being the gnarliest in Colorado, it starts off mild enough that mildly-built Jeeps can handle it. Furthermore, since it is close to the graded dirt 21 Road at the beginning, if it gets too hairy for you, you can bail out. However, the upper end of the trail is territory for Jeeps who could care less about body damage, buggies, huge tires, or amazing driving skills. Once you get all the way up, your options are to either grab the service road out to 16 Road or turn around and wheel back down the trail. Of course, we went with option B.