U.S. Route 14 (US 14) is an east‑west United States Numbered Highway that traverses the state of South Dakota from the Wyoming border near Belle Fourche to the Minnesota border near Elbow Lake, entering the state on the western edge of the Black Hills and exiting on the eastern prairie. Within South Dakota the highway is maintained by the South Dakota Department of Transportation (SDDOT) and serves as a principal arterial corridor linking several major communities, including Belle Fourche, St. Lawrence, Rapid City, Mitchell, and the state capital, Pierre.
Route description
- Western terminus – US 14 enters South Dakota from Wyoming at the state line west of the town of Belle Fourche, where it continues as a four‑lane divided highway.
- Black Hills – The route passes north of the Black Hills, intersecting US 85 in Belle Fourche and providing access to the Badlands National Park via US 212 near Wall.
- Rapid City corridor – US 14 becomes a surface street (Brittany Street) through Rapid City, intersecting Interstate 90 (I‑90) at exit 30. It continues eastward as a four‑lane highway toward the eastern part of the state.
- Central plain – The highway runs concurrently with US 16 from Rapid City to Wall, then diverges and proceeds eastward across the James River basin, passing through the small towns of Edgemont, St. Lawrence, and the agricultural community of Fort Pierre.
- Pierre – In the state capital, US 14 shares an alignment with US 83 for a short segment along the Missouri River, crossing the river via the Fort Pierre Bridge.
- Eastern segment – Continuing east, US 14 follows a generally straight course across the prairie, intersecting US 281 near Platte and US 212 near the town of Plankinton. It passes through the city of Mitchell, where it meets US 81 and the western terminus of the North Dakota segment of the Theodore Roosevelt National Scenic Byway.
- Eastern terminus – US 14 leaves South Dakota at the Minnesota state line near the town of Big Stone Lake, where the roadway continues as Minnesota State Highway 9.
The total length of US 14 within South Dakota is approximately 460 miles (740 km).
History
- Establishment – US 14 was designated as part of the original United States Numbered Highway System in 1926. At that time, the route largely followed existing auto trails, including the Black and Yellow Trail and the Yellowstone Trail, which connected the Pacific Northwest with the Midwest.
- Realignments – Throughout the mid‑20th century, US 14 underwent several realignments to improve traffic flow and accommodate the construction of I‑90. Notable changes include the bypass of downtown Rapid City in the 1960s and the relocation of the eastern segment near Mitchell in the 1970s to avoid small-town congestion.
- Modern upgrades – Since the 1990s, SDDOT has progressively upgraded portions of US 14 to four‑lane divided highway standards, particularly between the Wyoming border and Rapid City, and between Mitchell and the Minnesota border, to support commercial traffic and regional tourism.
Major intersections
| County | Location | Milepost* | Intersecting route | Notes |
|---|---|---|---|---|
| Butte | Belle Fourche | 0.0 | US 85 | Western state line |
| Lawrence | St. Lawrence | 37.2 | SD 34 | Access to US 212 |
| Pennington | Rapid City | 81.5 | I‑90 (exit 30) | Concurrency with US 16 (Wall) |
| Hughes | Pierre | 227.9 | US 83 | Missouri River crossing |
| Davison | Mitchell | 310.3 | US 81 / SD 38 | Concurrency with US 81 |
| Hanson | Westbrook | 417.4 | US 281 | Rural crossing |
| Grant | Big Stone Lake | 460.0 | MN 9 | Eastern state line |
*Mileposts are measured from the Wyoming state line; values are approximate.
Significance
US 14 serves as a critical transportation corridor for intra‑state commerce, particularly agriculture and tourism. The highway provides the primary east‑west link for the Black Hills region and the eastern prairie, supporting freight movement between the Rocky Mountain corridor and the Upper Midwest. It also offers access to several national and state recreation areas, such as Badlands National Park, the Jewel Mountain National Recreation Area, and the Missouri River Valley.
Maintenance
The South Dakota Department of Transportation is responsible for routine maintenance, resurfacing, and winter snow removal on US 14. The highway is designated as part of the National Highway System (NHS) for segments that carry significant national defense, economic, and mobility functions, primarily the portions between the Wyoming border and Rapid City, and between Mitchell and the Minnesota border.
See also
- U.S. Route 14 (national overview)
- List of United States Numbered Highways in South Dakota
- Interstate 90 in South Dakota
All information reflects currently available public records and established encyclopedia entries as of 2026. No speculative content is included.
