SDCL § 31-4-182: State Highway 87 from U.S. Highway 385 to U.S. Highway 16.

The state trunk highway system includes the following in Custer and Pennington counties:

(1) From a point on the north boundary of Wind Cave National Park in section one, township five south, range five east, thence northerly to U.S. Highway 16 Alternate east of Custer near the west quarter corner of section twenty-five, township three south, range five east;

(2) From a point on U.S. Highway 16 Alternate east of Custer east of the southwest corner of section nineteen, township three south, range six east, thence northwesterly to U.S. Highway 16 south of Hill City near the center of section twelve, township two south, range four east.