S.D. Codified Laws § 13-6-82
Nothing in this chapter shall be construed to authorize the transfer of the liabilities of existing bonded indebtedness from the district or territory against which it was originally incurred. Should there be any existing bonded indebtedness outstanding against a district, the county auditor shall continue the annual tax levy that was provided for the redemption of such bond issue. The board of county commissioners shall have the same authority as a school board under the provisions of §§ 13-16-10 to 13-16-14, inclusive. The board of county commissioners shall direct the treasurer of the school board of the said former school district to transfer all money in the bond redemption fund as of the close of the last school fiscal year the district existed, to the county treasurer and the said county treasurer shall place such money so received in a trust fund along with the receipts from the annual tax levy provided in § 13-6-81 and shall be authorized to invest any surplus money in this trust fund in such securities as are authorized by law for school district funds and the income from such investments shall be added to such trust fund. The county treasurer shall apply the money in the said trust fund to the redemption of such bonded indebtedness as the bonds become due and payable and, if sufficient money is available, may negotiate with the bondholders to purchase outstanding bonds ahead of schedule when such action is deemed advisable and so ordered by the board of county commissioners. When the bonds are paid and canceled, the county treasurer shall place the unused balance in the said trust fund, if any, to the credit of the district or districts containing territory of the former school district.
SDCL 13-6-82