Iowa Admin. Code r. 571-37.57
Unrestricted-horsepower vessels may be operated at a speed not greater than 5 miles per hour only from September 8 through May 20 of each year. A motorboat with a power unit exceeding 10 horsepower shall not be permitted the remainder of the year.
[ARC 9219C, IAB 5/14/25, effective 6/18/25]