It goes green to black within the first half mile and then mellows on top of spruce mountain. It loops for 2.5 miles and then heads back down the one mile track you came up.
Take Interstate 25 exit 163 (County Line Road), turn left and drive 2.5 miles to a T intersection. Turn right on Spruce Mountain Road and drive 3.6 miles to a primitive dirt parking lot on the left.
http://www.singletracks.com/item.php?c=1&i=1739