In levee and drainage districts having pumping stations trustees shall hold office until the fourth Saturday in January three years after election. On the third Saturday in January of each year a trustee shall be elected for a term of three years to succeed the member of the board whose term will expire on the following Saturday. At the election there shall also be elected, if necessary, a trustee to fill any vacancy which occurred before the election.
Iowa Code § 468.519
83 Acts, ch 101, §99; 89 Acts, ch 126, §2