The state trunk highway system includes the following in Buffalo, Brule, Charles Mix, Bon Homme, Yankton, Clay, and Union counties:

(1) From a point on State Highway 34 east of Fort Thompson, thence southerly via Chamberlain to Interstate Highway 90 south of Chamberlain;

(2) From a point on Interstate Highway 90 south of Pukwana, thence southerly and easterly to State Highway 44 west of Platte;

(3) From a point on State Highway 44 east of Platte, thence southerly and easterly to U.S. Highway 18 in Lake Andes;

(4) From a point on U.S. Highway 18 east of Lake Andes, thence south to State Highway 46 west of Wagner;

(5) From a point on State Highway 46 east of Wagner, thence southerly and easterly via Avon, Tyndall, and Tabor to U.S. Highway 81 north of Yankton;

(6) From a point on U.S. Highway 81 at the intersection of Broadway Street and 4th Street in the city of Yankton, thence easterly via Yankton and Vermillion to the Iowa state line.

Source: SL 1984, ch 209, § 43; SL 2021, ch 123, § 2.