(a) The Lewis and Clark Joint Powers Board is eligible to receive an aid distribution under this section equal to (1) the principal and interest payable in the succeeding calendar year for bonds issued under section 469.194 minus the sum of (2) the combined adjusted net tax capacity of Rock County and Nobles County for the assessment year prior to the aid payable year multiplied by 1.5 percent and (3) 50 percent of any federal aid received to fund the project in the calendar year. The board shall certify to the commissioner of revenue any federal aid allocated to the project for the calendar year and the principal and interest due in the succeeding calendar year by June 1 of the aid payable year. The commissioner of revenue shall calculate the aid payable under this section and certify the amount payable before July 1 of the aid distribution year. The commissioner shall pay the aid under this section to the board at the times specified for payments of local government aid in section 477A.015. An amount sufficient to pay the state aid authorized under this section is annually appropriated to the commissioner from the general fund.
(b) The board must allocate the aid to the municipalities issuing bonds under section 469.194 in proportion to their principal and interest payments.
(c) If the deduction under paragraph (a), clause (3), eliminates the aid payment under this section in a calendar year, then the excess of the deduction must be carried over and used to reduce the principal and interest in the succeeding year or years used to calculate aid under paragraph (a).
(d) If federal grants and aid received for the project, not deducted under paragraph (a), clause (3), exceed the total debt service payments for bonds issued under section 469.194, other than payments made with state aid under this section, the joint powers board must repay any excess to the commissioner of revenue for deposit in the general fund. The repayment may not exceed the sum of state aid payments under this section and any other grants made by the state for the project.
(e) This section expires at the earlier of January 1, 2039, or when the bonds authorized under section 469.194 have been paid or defeased.