S.D. Codified Laws § 31-4-225 (2026)
The state trunk highway system includes the following in Hanson and McCook counties: From a point on Interstate Highway 90 north of Alexandria north of the southeast corner of section four, township one hundred two north, range fifty-eight west, thence southeasterly via Alexandria, Emery, and Bridgewater to State Highway 42 in Bridgewater west of the southeast corner of section thirteen, township one hundred one north, range fifty-six west.
Source: SL 1984, ch 209 , § 98.