Gratiot River North. a North Woods Conservancy site, contains 495 acres that include miles of hiking and biking trails and 4,988 feet of Lake Superior agate-rich cobble shoreline. Fire, camping and motorized vehicles are prohibited. Located northwest of Ahmeek of the Five Mile Point Road, access is via a trail-head parking area and trail easement at the terminus of Tanskanen Road or from the Gratiot River County Park. Admission is free. Open during daylight hours year round.