Mich. Comp. Laws § 324.32102: Compact; ratification.

Sec. 32102.

Such compact shall become operative whenever, in addition to Michigan, any 3 of the states of Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York and Minnesota shall have ratified it and congress has given its consent, if needed. The province of Ontario may become a party to this compact by taking such action as its laws and the laws of the Dominion of Canada may prescribe for ratification.