Operation of vessels of the impoundment of the Maquoketa River in Delaware County, Iowa, extending westerly and northerly from the line between Sections 29 and 30 in Delhi Township in said county, to the line between Sections 10 and 15 in Milo Township in said county which impoundment is sometimes known and referred to as Hartwick Lake or Lake Delhi.
Iowa Admin. Code r. 571-40.16