As Jason said, most all of the area is on public land except for a small portion owned by a local church. Over the last couple years a lot of trail work has been done in the twin buttes area for hiking and mountain biking. In several places the grade is used.
Here is a map of the current trail system. The trail head marker is where we parked and began the hike. This is all very easy to access and a beautiful area. Next time I'd like to follow the grade as far down to Franklin Junction as possible. The junction itself seemed relatively untouched until a couple years ago when road building for a new subdivision began.
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www.durangoutdoors.com]
-Jon