Michigan Compiled Laws, Chapter 254. Bridges § 254.25

Sec. 25. Hereafter, no person, firm, corporation, or municipality shall artificially alter the stage of water or widen or deepen the channel of any watercourse, except drains established by public authority, without first securing a written permit therefor from the commissioner or commissioners having jurisdiction over all the bridges and culverts on or over said watercourse, or the portion thereof affected by such proposed change.