South Dakota Codified Laws 31-4-148. State Highway 25 from State Highway 50 to North Dakota
The state trunk highway system includes the following in Bon Homme, Hutchinson, Hanson, Miner, Kingsbury, Clark, Day, Marshall, and Roberts counties:
(1) From a point on State Highway 50 east of Tyndall thence north via Scotland to U.S. Highway 18;
(2) From a point on State Highway 262 thence northerly to State Highway 34 east of Roswell;
(3) From a point on State Highway 34 west of Howard thence north via DeSmet to State Highway 28 southeast of Willow Lake;
(4) From a point on State Highway 28 east of Willow Lake thence north to U.S. Highway 212 east of Clark;
(5) From a point on U.S. Highway 212 west of Henry thence northerly via Webster to State Highway 10;
(6) From a point on State Highway 10 east of Lake City thence northeasterly via Veblen to the North Dakota state line.
Source: SL 1984, ch 209, § 21; SL 1986, ch 236, § 2; SL 1992, ch 202, § 2; SL 2008, ch 145, § 1.