The state trunk highway system includes the following in Todd, Mellette, Jones, Lyman, Stanley, Hughes, Sully, Potter, Walworth, and Campbell counties:
(1) From the Nebraska state line south of Mission in section twenty-three, township thirty-five north, range twenty-eight west, thence northerly via Mission to U.S. Highway 18 north of the southeast corner of section thirty-two, township thirty-nine north, range twenty-eight west;(2) From a point on U.S. Highway 18 west of Mission near the southwest corner of section thirty-six, township thirty-nine north, range twenty-nine west, thence north to Interstate Highway 90 north of the southwest corner of section seven, township two south, range twenty-nine east;(3) From a point on Interstate Highway 90 south of Fort Pierre in section nine, township one hundred five north, range seventy-nine west, thence north via Fort Pierre to U.S. Highway 14 in section twenty-eight, township five north, range thirty-one east;(4) From a point on U.S. Highway 14 west of Blunt north of the southwest corner of section fourteen, township one hundred twelve north, range seventy-seven west, thence north to U.S. Highway 212 west of Gettysburg near the northwest corner of section twenty-five, township one hundred eighteen north, range seventy-seven west;(5) From a point on U.S. Highway 212 west of Gettysburg near the southwest corner of section nineteen, township one hundred eighteen north, range seventy-six west, thence north to U.S. Highway 12 south of Selby in the southwest quarter of section twenty-one, township one hundred twenty-three north, range seventy-six west;(6) From a point on U.S. Highway 12 north of Selby near the south quarter corner of section nineteen, township one hundred twenty-four north, range seventy-six west, thence north via Mound City and Herreid to the North Dakota state line near the northwest corner of section five, township one hundred twenty-eight north, range seventy-six west.