571—40.16 (462A) Maquoketa River. 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.
	 40.16(1) Water recreation activity restrictions shall be obeyed, including restrictions within posted areas which are marked with approved buoys.
	 40.16(2) No motorboat shall be operated at speeds greater than ten miles per hour at any time between the hours from one hour after sunset to one hour before sunrise.