S.D. Codified Laws § 31-4-133 (2026)
The state trunk highway system includes the following in Moody and Brookings counties: From a point on State Highway 34 south of Flandreau near the southwest corner of section three, township one hundred six north, range forty-eight west, thence northerly via Flandreau and Elkton to U.S. Highway 14 north of Elkton near the northeast corner of section eight, township one hundred nine north, range forty-seven west.
Source: SL 1984, ch 209 , § 6.