North Point Road to Brandreth

I enjoy running on North Point Road in the Buttermilk Falls/Forked Lake area. At the Forked Lake turnoff there's that ominous "Dead End" sign, but I know the road goes on forever and a day past it.

I've wanted to do a bike trip but never having been more than a mile or so past the dead end sign I'm curious as to how far the public road goes.

Is there a point where it becomes gated and/or private so as to exclude road bikes?

Thanks for any information.