Hunting! This is the main reason you’ll be using FR 9129D. Alto Spring is a game hotspot (in wet years) and excellent hunting territory. During the Fall, the aspens turn golden. You’ll also find many prime campsites on side trails, with great views of the Peaks. If the snow flies early, this is a tremendous snow-wheeling road.
If you come at other times of the year, you’ll be able to hike, mountain bike, or snowshoe, and you’ll have the place entirely to yourself due to that locked gate. This is an excellent spot for a short overnight backpacking trip when the gate is closed during the summer.