S.D. Codified Laws § 31-4-219 (2026)
The state trunk highway system includes the following in Edmunds and McPherson counties: From a point on U.S. Highway 12 in Roscoe near the southeast corner of section twenty-four, township one hundred twenty-three north, range seventy-one west, thence north via Roscoe to State Highway 10 near the northeast corner of section two, township one hundred twenty-six north, range seventy-one west.
Source: SL 1984, ch 209 , § 92.