S.D. Codified Laws § 31-4-200 (2026)
The state trunk highway system includes the following in Grant County: From State Highway 20 south of Milbank near the northwest corner of section nineteen, township one hundred nineteen north, range forty-eight west, thence east to the Minnesota state line east of Stockholm near the northwest corner of section twenty-two, township one hundred nineteen north, range forty-seven west.
Source: SL 1984, ch 209 , § 73.