Well, I have looked for my old maps, and I cannot find them. I know for a fact that the route we took was just north of all the stores in Cadillac. We crossed US-131 using E. 34 road or E. 36 road, I do not remember which one exactly. Back then, I don't think the current US-131 was even there. We then followed along the north side of M-55 until we got to the south side of Lake City. We crossed M-66 just south of Lake City and continued towards Houghton Lake. Since M-55 makes a jog around Lake City, the trail then followed along the south side of M-55 towards Houghton Lake. The trail eventually connected to the current trail that crosses M-55 on the west side of Houghton Lake. We may have used ORV trails at the time for some of it. Hope some of this helps.