S.D. Codified Laws § 31-4-204 (2026)
The state trunk highway system includes the following in Aurora County: From a point on State Highway 258 east of Plankinton near the west line of section twenty-four, township one hundred three north, range sixty-four west, thence north to the entrance of the state training school near the northeast corner of section fourteen, township one hundred three north, range sixty-four west.
Source: SL 1984, ch 209 , § 77.