Mich. Comp. Laws § 247.477
After the county road commissioners shall have made their apportionment of benefits, and held a review of the same, whether an appeal has been taken therefrom or not, but in case of appeal, then after such appeal shall have been decided, and it shall appear that any parcel of land has been omitted by clerical error within the boundaries of the district finally established, or that parcels of land have been misdescribed, or the acreage stated to be more or less than it really is or that the amount appearing on the roll as assessed against any parcel of land is erroneous because of a clerical error, the county road commissioners, or the state highway commissioner, as the case may be, may correct such errors in the manner herein provided.
MCL 247.477