Porcupine Mountain Loop Professional Review and Guide
"A trip to the Upper Peninsula is not complete without a visit to the Porcupine Mountains Wilderness, the largest state park in Michigan. Crouched along the shore of Lake Superior, the park offers waterfalls, Lake Superior views, and 90 miles of hiking trails. Mountain bikes are not allowed on the hiking trails—except for two short sections where the hiking and cross-country skiing trails merge. Instead, the 25 miles of cross-country skiing trails become mountain biking trails in the summer.
This ride begins by cycling along a road built in the 1800s, then climbs to the top of the downhill ski area for breathtaking views of Lake Superior. Many of the trails are near creeks or rivers in low-lying areas, so mud and soft soil are problems. Branches, rocks, and brush are common; however, the trails are wide enough that cyclists can skirt around most obstacles. Tread: 13.8 miles of wide ski trails."