The East Loop: (Gruber's Grind)
Total length can reach 15.8 miles, and one of the hardest trails I have been on. The entire loop will take around 3 hours so Make sure to carry extra provisions (tubes, food, water). If you are feeling secure in your handling and riding skills, this trail will be a wake up call. There are miles of short steep climbs and decents, rocks, stumps, and log crossings. The log crossings are endless, there were several normal sized ones and a few large ones. The other trails in the area (Pontiac, Highland) had made me a bit lazy when it came to crossing logs, I managed to bottom out on almost every one. Grubers Grind, even though it is unrelenting in chalenging it does allow you to bail after about 7 miles or so. There is fairly well marked return path which brings you back to the dirt road.
      Just like Highland this course will make you stop, shift, turn, brake, and balance for hours, this is guaranteed to mentally exhausted you and fatigue your upper body, rather than your legs. Once you finish the reward will settle in, as you make up stories about near death experiences, and cleaning seemingly impassable sections. This place will create a challenge for years to come. Many of this trail should not be ridden alone or after dusk (without a headlamp). The state does require a parking permit, if you need one they can be purchased by filling out the envelope (with money) and placing it in the daily registration canister.