Rule 7. On the waters of that part of Lake Columbia lying south and west of a line beginning from the easterly most corner of lot number 99 extending to the northerly most corner of lot 76 in Grand Pointe Shores subdivision, part of the northeast 1/4 of section 33 and part of the southeast 1/4 of section 28, town 4 south, range 1 east, township of Columbia, county of Jackson, state of Michigan, no operator of any motorboat shall exceed a slow-no wake speed.
Mich. Admin. Code R. 281.738.7