Ind. Code § 8-10-1-17
The ports of Indiana shall be authorized to fix, review, charge, and collect fees, tolls, rentals, and other charges for the use of the ports, projects, terminal facilities, and lands under the jurisdiction or control of the ports of Indiana or services rendered by the ports of Indiana, and the aggregate thereof shall provide revenues at least sufficient to pay the cost of operation, maintenance, and repair of the port or project and terminal facilities, including the administration expenses of the ports of Indiana, and in case revenue bonds are issued, sufficient to pay the interest on and principal of the bonds in accordance with their terms, and also sufficient to establish and maintain reserves created for all such purposes and for depreciation purposes. The fixing and collection of such fees, tolls, rentals and other charges and the expenditure of the revenues derived therefrom shall not be subject to the supervision or regulation by any other officer, commission, board, bureau, or agency of the state. After such bonds have been fully paid and discharged and all obligations under any trust agreement securing the same have been performed or satisfied, any remaining surplus net revenues and all surplus net revenues thereafter derived from the operation of the port or project shall be paid into the state general fund.
IC 8-10-1-17