S.D. Codified Laws § 31-4-222 (2026)
The state trunk highway system include the following in Gregory County: From a point on the Nebraska state line south of Gregory near the southeast corner of section thirty-five, township ninety-five north, range seventy-three west, thence north to U.S. Highway 18 near the northeast corner of section fourteen, township ninety-seven north, range seventy-three west.
Source: SL 1984, ch 209 , § 95.