The state trunk highway system includes the following in Gregory, Charles Mix, Douglas, Aurora, Jerauld, Beadle, Spink, and Brown counties:
(1) From a point on the Nebraska state line near the west line of section thirty-six, township ninety-five north, range sixty-seven west, thence north to U.S. Highway 18;
(2) From a point on U.S. Highway 18 south of Armour, thence north via Armour and Corsica to U.S. Highway 14 west of Huron;
(3) From a point on U.S. Highway 14, north of Wolsey, thence northerly via Redfield and Aberdeen to the North Dakota state line.