South Dakota Highway 115 begins at an intersection with US 18 west of Canton and heads due north through rural Lincoln County. The highway runs just east of Worthing and about a mile west of Harrisburg, South Dakota. Three miles north of the Harrisburg intersection, SD 115 intersects 85th Street and enters Sioux Falls from the south.
South Dakota Highway 115 begins at an intersection with US 18 west of Canton and travels northward through rural Lincoln County. The highway is located near Worthing and about a mile west of Harrisburg, South Dakota. Three miles north of the Harrisburg junction, SD 115 intersects 85th Street and enters Sioux Falls from the south.