The state trunk highway system includes the following in Jackson, Jones, and Lyman counties:
From a point on State Highway 240 at Cactus Flats near the northeast corner of section thirty-six of township two south, range eighteen east, thence east via Kadoka, Belvidere, Murdo, Draper, Presho, Kennebec, and Reliance to Interstate Highway 90 near the southeast corner of section twenty-nine, township one hundred five north, range seventy-three west.