For GPS purposes, the address is approximately:
57000 block of Buckhorn Rd., Three Rivers, MI 49093

From downtown Three Rivers: From N. Main Street, turn right (east) onto East Hoffman Street. Travel about 0.35 mile and turn left onto Portage Avenue. Continue for another 0.6 mile and the preserve will be on the right.

From US-131: Turn east onto Heimbach Road at Three Rivers. Turn left (east) and go to the four-way stop at Buckhorn Road (about 0.8 miles). Turn right and go south 2.5 miles. Buckhorn becomes Portage Road, and you will see the dirt parking lot and preserve sign on the left (east) side, near 1501 Portage Road.