S.D. Codified Laws § 31-21-11
Current with legislation signed by the governor on or before 3/6/2024
At any time after a ditch shall have been opened under this chapter it shall be lawful for the officer or person having the highway in charge, from time to time as it may be necessary, to enter upon the lands through which such ditch has been opened for the purpose of keeping it open and in good order and condition.
SDCL 31-21-11