South Dakota Codified Laws 31-4-247. State Highway 1806
The state trunk highway system includes the following in Gregory, Lyman, Stanley, and Corson counties:
(1) From a point on U.S. Highway 18 west of Bonesteel near the northeast corner of section two, township ninety–five north, range sixty–nine west, thence northeasterly to a point in section twenty, township ninety–seven north, range sixty–eight west;
(2) From a point south of State Highway 44 north of the southwest corner of section nine, township ninety–eight north, range seventy west, thence northerly to State Highway 44 west of Platte in section twenty–four, township ninety–nine north, range seventy–one west;
(3) From a point on State Highway 273 north of Kennebec near the northeast corner of section eighteen, township one hundred seven north, range seventy–five west, thence northwesterly along Lake Sharpe to U.S. Highway 83 south of Fort Pierre in section two, township four north, range thirty–one east;
(4) From a point on U.S. Highway 14 in Fort Pierre in the southeast quarter of section twenty, township five north, range thirty–one east, thence northerly along Oahe Reservoir to a point near the southwest corner of section twenty–four, township eight north, range twenty–seven east;
(5) From a point south of U.S. Highway 12 at Sacajawea Monument near the south line of section thirteen, township eighteen north, range twenty–nine east, thence northerly to U.S. Highway 12 in section thirty–six, township nineteen north, range twenty–nine east;
(6) From a point on U.S. Highway 12 near the southeast corner of section twenty–five, township nineteen north, range twenty–nine east, thence northerly along Oahe Reservoir to a point in section twenty–four, township twenty–two north, range twenty–nine east.
Source: SL 1984, ch 209, § 120.