S.D. Codified Laws § 5-2-11.1
In all cases in which an order, decree, or similar document entered by an authorized office or agency, providing for abandonment of any railroad, or portion thereof, has been recorded in the office of the register of deeds of any county through which such abandoned railroad, or portion thereof, extends, the commissioner of school and public lands shall prepare and execute an affidavit, or document certified as the official act of his office, as to each county through which such abandoned railroad, or portion thereof extends, in which the Department of School and Public Lands presently has, or previously had, since the establishment of such railroad, any right, title, or interest. The affidavit or other document shall describe each legal subdivision through which such railroad extends and the portion acquired for establishing the railroad.
SDCL 5-2-11.1