SDCL § 31-4-162: State Highway 42 from U.S. Highway 281 to Iowa.

The state trunk highway system includes the following in Aurora, Davison, Hanson, McCook, and Minnehaha counties:

(1) From a point on U.S. Highway 281 south of Stickney, thence east to the Davison County line;

(2) From a point on State Highway 37 south of Mitchell, thence east via Ethan and Bridgewater to a point on Ellis Road west of Sioux Falls;

(3) From a point on Six Mile Road east of Sioux Falls to the Iowa state line.