What's the story with access?
Don't kill anyone and don't (wink wink) exceed 15 mph. It's wide open.
Over the years the road had become so eroded that it was useless for its primary purpose, which is to provide a route for fire vehicles to enter public lands. It was so rutted that even on modern bikes you couldn't go as fast as in the old days.
So last year a road grader was sent to repair the road, and my suspicion is that it was driven by a mountain biker. In any event, the driver turned it into a smooth, steep, and fast run again with some strategically placed jumps. It remains a local favorite. Saw a dozen or so mud-covered riders riding together today on the road that leads away from it.
My book, Fat Tire Flyer: Repack and the Birth of Mountain Biking
is at your bookseller and on Amazon