S.D. Codified Laws § 31-4-136 (2026)
The state trunk highway system includes a highway in Brookings County stretching from a point on U.S. Highway 14 west of the city of Brookings, thence easterly via Brookings to U.S. Highway 14 east of Brookings.
Source: SL 1984, ch 209 , § 9; SL 2005, ch 150 , § 1; SL 2025, ch 112 , § 1.