Highway 81. The state trunk highway system includes the following in Bon Homme and Yankton counties: (1) From a point on State Highway 37 north of Springfield near the northwest corner of section one, township ninety - three north, range sixty west, thence east to State Highway 50 south of Tabor near the southeast corner of section thirty - five, township ninety - four north, range fifty - eight west; (2) From a point on State Highway 50 west of Yankton near the northeast corner of section three, township ninety - three north, range fifty - seven west, thence southerly and easterly via Yankton to U.S. Highway 81 at the intersection of 4th Street and Broadway Street. Source: SL 1984, ch 209 , § 44.