The state trunk highway system includes the following in Union, Lincoln, Minnehaha, Moody, Brookings, Deuel, Hamlin, Codington, Grant, and Roberts counties:

From a point on the Iowa state line near the center of section twenty–six, township eighty–nine north, range forty–eight west, thence northerly via North Sioux City, Sioux Falls, Brookings, and Watertown to the North Dakota state line on the north line of section thirty, township one hundred twenty–nine north, range forty–nine west.

Source: SL 1984, ch 209, § 25.