Mich. Comp. Laws § 41.282

Sec. 12. After the completion of said proposed improvement, the highway authorities having jurisdiction over the highway involved, shall maintain and repair said pavement and/or sidewalk and shall keep the same in a reasonably safe condition for public travel, using for this purpose any money which may be available for the maintenance and repair of said highway. If there is a surplus of the money collected after paying the cost of building such proposed improvement, the same shall be turned over to the highway authorities having the responsibility for the maintenance and repair thereof and shall be used solely for such maintenance and repair. If the improvement is in more than 1 highway jurisdiction, the fund shall be prorated between such jurisdictions according to the amount of the improvement in each.