South Dakota Codified Laws 31-4-137. State Highway 15 from State Highway 28 to Interstate Highway 29
The state trunk highway system includes the following in Deuel, Grant, and Roberts counties:
(1) From a point on State Highway 28 west of Toronto near the southwest corner of section twenty–three, township one hundred thirteen north, range forty–nine west, thence north via Clear Lake and Altamont to U.S. Highway 212 north of Altamont near the southeast corner of section thirty–four, township one hundred seventeen north, range forty–nine west;
(2) From a point on U.S. Highway 212 south of Milbank near the southwest corner of section eighteen, township one hundred seventeen north, range forty–eight west, thence north to State Highway 20 south of Milbank near the southwest corner of section nineteen, township one hundred eighteen north, range forty–eight west;
(3) From a point on State Highway 20 south of Milbank near the southwest corner of section eighteen, township one hundred nineteen north, range forty–eight west, thence north and west via Milbank to Interstate Highway 29 near the west line of section twenty–six, township one hundred twenty–three north, range fifty–one west.
Source: SL 1984, ch 209, § 10.