SDCL § 31-4-168: State Highway 48 from Interstate Highway 29 to Iowa.

The state trunk highway system includes the following in Union County:

From a point on Interstate Highway 29 northwest of Elk Point near the north quarter corner of section thirty, township ninety-three north, range fifty west, thence easterly to the Iowa state line near the southwest corner of section thirty, township ninety-three north, range forty-eight west.