Unfortunately the Michigan Lakes & Streams Association (MLSA) doesn’t provide statutory authority for its published rules. Browsing the statutes, I found this:
"324.80145 Operation of vessels; speed; interference with use of waters by others; violation; fine.
“A person operating or propelling a vessel upon the waters of this state shall operate it in a careful and prudent manner and at such a rate of speed so as not to endanger unreasonably the life or property of any person. A person shall not operate any vessel at a rate of speed greater than will permit him or her, in the exercise of reasonable care, to bring the vessel to a stop within the assured clear distance ahead. A person shall not operate a vessel in a manner so as to interfere unreasonably with the lawful use by others of any waters. A person who violates this section is responsible for a state civil infraction and may be ordered to pay a civil fine of not more than $500.00.”
"324.80149 Operation of vessels in counter-clockwise fashion; distance between persons being towed and other objects; exception; violation as misdemeanor; violation as civil infraction; fine.
" (1) A person operating a vessel on the waters of this state in areas not marked by well defined channels, canals, rivers, or stream courses shall operate the vessels in a counter-clockwise fashion to the extent that it is reasonably possible. These persons and persons being towed on water skis or on a water sled, kite, surfboard, or similar contrivance shall maintain a distance of 100 feet from any dock, raft, buoyed or occupied bathing area, or vessel moored or at anchor, except when the vessel is proceeding at a slow—no wake speed or when water skiers are being picked up or dropped off, if that operation is otherwise conducted with due regard to the safety of persons and property and in accordance with the laws of this state. Except as otherwise provided in subsection (2), a person who violates this section is guilty of a misdemeanor.
“(2) A person who violates this section while on any of the following bodies of water in this state is responsible for a state civil infraction and may be ordered to pay a civil fine of not more than $500.00:
(a) The Great Lakes.
(b) Lake St. Clair.
© The St. Clair river.”
Probably safe to say that none of these rules are enforced unless there’s a serious accident.