The first mile of this trail is actually an ATV-width trail, but then the remaining trail is singletrack. The ATV portion is a descent down a steep ridge line into a drainage. Once in the drainage, you'll cross a road.
From this point the trail is singletrack and will climb at a mellow pace back up to the ridge line. Then the trail will meander along the ridge for a while, and you'll have some amazing views. You'll then cross a second road and continue along a mellow course.
Once you make the third road crossing, the trail character will change dramatically. You'll be dumped onto a rugged and steep trail with some tight switchbacks as you descend Virginia Creek. This section of trail is very rowdy and will test your bike handling skills for sure. As the valley widens, you'll finish at a nice bridge and the South Fork of the Boise.