S.D. Codified Laws § 31-12-2
Current with legislation signed by the governor on or before 3/6/2024
Except for minimum maintenance roads established pursuant to § 31-12-46, no county highway system may be changed, altered, or modified except by authority of and in accordance with a written executive order of the Department of Transportation. Any such change shall be shown on the map of the county highway system in an office designated by the board of county commissioners and on such map in the Department of Transportation.
SDCL 31-12-2