S.D. Codified Laws § 31-4-198 (2026)
The state trunk highway system includes the following in Walworth County: From a point in Akaska near the northwest corner of section two, township one hundred twenty-one north, range seventy-seven west, thence east to U.S. Highway 83 south of Selby near the northeast corner of section six, township one hundred twenty-one north, range seventy-six west.
Source: SL 1984, ch 209 , § 71.