From NPS Site: site page: https://www.nps.gov/bicy/planyourvisit/bear-island-unit-trails-and-facilities.htm Map PDF link: https://www.nps.gov/bicy/planyourvisit/upload/2014-BIU-Map.pdf The upper left part of the map near 29 states: "No Recreational ORV Access" The center lower part of the map near 75 states: "No Access to I-75"

Yes, it is. As long as the Wagon wheel gate is open. I75 Rt 29 south Left onto Wagon Wheel rd. Follow the signs

no only by us41 and 25 mills nopaved road ,

No, you have to come in from the south.