S.D. Codified Laws § 31-4-157 (2026)
The state trunk highway system includes the following in Custer County: From a point on U.S. Highway 16 Alternate east of Custer near the east quarter corner of section twenty-four, township three south, range six east, northeasterly to State Highway 79 south of Hermosa near the southeast corner of section thirty-one, township two south, range eight east.
Source: SL 1984, ch 209 , § 30.