Mich. Comp. Laws § 119.18

Sec. 18. (1) Upon dissolution of a metropolitan district under sections 16 and 17, the legislative body of the district shall deposit all records of the metropolitan district with the clerk of the county in which the district was located, or, if the district was located in more than 1 county, with the clerk of the county in which the largest part of the district was located, for safekeeping and reference. (2) Upon dissolution of a metropolitan district, the legislative body of the district shall notify the governor, in writing, of the dissolution.