Also look at www.atvoffroad.net
- they sell a Ogemaw county map showing the approved roads around Rose City.
Basically there are a few lower peninsula counties that allow ORV operation on road shoulders (county roads, not state routes) like Presque Isle and Montmorency. Ogemaw county allows it outside West Branch township (i.e. around Rose City and the Clear Lake area). Oscoda has a specific route from town to the Huron Trail as well.
The UP is much more open.