Mich. Comp. Laws § 317.205

Sec. 5. Dedications under this act may at any time be modified or terminated upon the application of the dedicator and approval by the conservation commission, or may be terminated without the application of the dedicator in case the commission shall determine that a given dedication has become ineffective or otherwise not in the public interest or that the dedicator has failed to erect or maintain the signs and posters provided for in section 3.