South Dakota Highway 15

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Highway 15 marker

Highway 15
Route of SD 15 (in red)
Route information
Defined by SDCL §31-4-137
Maintained by SDDOT
Length: 79.430 mi[1] (127.830 km)
Existed: 1926 (approx.) – present
Major junctions
South end: SD 28 west of Toronto
North end: I-29 west of Wilmot
Counties: Grant, Deuel
Highway system
  • South Dakota Highways
US 14A SD 16

South Dakota Highway 15 is a state route that largely runs north to south across northeastern South Dakota. The northern terminus is at the junction with Interstate 29 west of Wilmot (exit 213) and the southern terminus is at I-29 west of Toronto (exit 150). It is 78 miles (129 kilometers) in length.

Route description[edit]

The route of SD 15 is defined in South Dakota Codified Laws § 31-4-137.[1]


King of Trails marker

South Dakota 15, when designated in the mid-1920s, ran north to south across the entire state, on the road known as the King of Trails. The extension of U.S. Highway 77 in 1930 largely replaced the numbering of SD 15, from Milbank to Sioux City. The northern portion of the route, from U.S. Highway 12 to the North Dakota border north of Claire City, remained in place.

In the early 1950s, changes were made to the southern end. SD 15 was rerouted so the south end was at Milbank; it then went north to Hartford Beach, then west through Wilmot to U.S. Highway 81, before heading north again. The old alignment from Wilmot to U.S. 12 was designated at South Dakota Highway 15A.

In 1976, the segment of SD 15 from the North Dakota border to Claire City was made part of a realigned South Dakota Highway 25, and the segment from Claire City to U.S. 81 near Claire City was designated as South Dakota Highway 106. At that point, the northern terminus was located at U.S. 81 west of Wilmot.

After U.S. 77 was deleted in the early 1980s, SD 15 was extended south along the former's alignment from Milbank, to the present end at I-29 west of Toronto.

Major intersections[edit]

County Location mi[1] km Destinations Notes
Deuel 0.000 0.000 SD 28 – Toronto, Estelline
Clear Lake 12.036 19.370 SD 22 – Castlewood, Canby, MN
22.179 35.694 US 212 west – Kranzburg Southern end of US 212 concurrency
26.978 43.417 US 212 east – Dawson, MN Northern end of US 212 concurrency
Grant 32.542 52.371 SD 20 east – Madison, MN Southern end of SD 20 concurrency
39.564 63.672 SD 20 west / SD 158 east – Stockholm Northern end of SD 20 concurrency, western terminus of SD 158
Milbank 46.727 75.200 US 12 – Twin Brooks, Big Stone City
Roberts 60.033 96.614 SD 109 south – Big Stone City
Wilmot 71.529 115.115 SD 123 south
78.364 126.115 I-29 – Fargo, ND, Sioux Falls I-29 exit 150.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Related routes[edit]

Highway 15A
Location: Wilmot
Existed: 1950s–1976

South Dakota Highway 15A was a short state route in northeastern South Dakota. This route was originally part of SD 15. In the early 1950s, the alignment of SD 15 was adjusted to add a segment between Wilmot and Milbank. The old alignment, between Wilmot and U.S. Highway 12, was designated as SD 15A. In 1976, when many of the suffixed state routes were eliminated, this route was redesignated as South Dakota Highway 123.


External links[edit]

Route map: Bing / Google

KML is from Wikidata