S.D. Codified Laws § 31-3-13
Current with legislation signed by the governor on or before 3/6/2024
In case the highway to be vacated, changed, or located is upon a township line, it shall be necessary that the board of supervisors of the adjoining civil township, or the board of county commissioners of the county, if the adjoining congressional township is unorganized, as the case may be, pass a like resolution and enter an order vacating, changing, or locating said highway.
SDCL 31-3-13