SDCL § 31-4-228: State Highway 273 from Interstate Highway 90 to State Highway 1806.

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

From a point on Interstate Highway 90 south of Kennebec north of the southeast corner of section eighteen, township one hundred five north, range seventy-five west, thence north via Kennebec to State Highway 1806 near the northeast corner of section eighteen, township one hundred seven north, range seventy-five west.