Michigan’s most visible sinkholes are along this 2½-mile trail that loops around five such depressions, some more than 100 feet deep. Gypsum deposits about 900 feet down that dissolve cause a collapse that creates sinkholes. Those along the Sinkholes Pathway are dry, while others nearby, like Shoepac Lk and Tomahawk Lk, [also Ford (11’N 27’W) and Section 4 (11N 27W) Lks over on the Shingle Mill Pathway as well as others near them] are filled with water. Some 2,600 acres of sinkhole area around the Sinkholes Pathway are closed to all motorized vehicles, providing a setting of forest solitude. These sinkholes are part of a karst system extending eastward to Lake Huron.
All these pathways can be found on our waterproof map (order here) except for the new Towerman’s Watch. We provide the latitude and longitude in minutes, leaving out the 45°N and 84°W, since they are the same across the area.