Rule 4. On the waters of the Huron river within the city of Ann Arbor, county of Washtenaw, state of Michigan, and on the waters of the Huron river from the Maple street bridge to the Dixboro street bridge, including Argo, Geddes and Barton ponds, township of Ann Arbor, county of Washtenaw, state of Michigan, no operator of any motorboat shall exceed a slow-no wake speed.
Mich. Admin. Code R. 281.781.4