# South Dakota Highway 34

South Dakota Highway 34 (SD 34) is a state route that runs parallel to Interstate 90 across the entire state of South Dakota. It begins at the Wyoming border west of Belle Fourche, as a continuation of Wyoming Highway 24 (WYO 24). The eastern terminus is at the Minnesota border east of Egan, or southwest of Airlie, Minnesota, where it continues as Minnesota State Highway 30 (MN 30). It is just over 419 miles (674 km) in length, making it the longest state highway in South Dakota.

## History

When first implemented in 1926, the western terminus was at South Dakota Highway 45 near Gann Valley. In the 1940s and early 1950s, a road was gradually built from Pierre to SD 45 via Fort Thompson, and SD 34 was extended west along it upon its completion. A further extension westward occurred in February 1961, when SD 34 absorbed the alignment of South Dakota Highway 24.
In the late 1960s, a portion of SD 34 (along with U.S. Highway 14) was upgraded as part of the construction of Interstate 90. The segment between Whitewood and Sturgis (exits 23 and 30) remains signed with I-90 and U.S. 14.
A 10-mile (16 km) segment of SD 34 in Sanborn County has been upgraded to 4 lanes. This is part of a 4-lane route from Huron to Mitchell via South Dakota Highway 37.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| Butte | West Butte | 0.000 | 0.000 | WYO 24 west – Hulett | Continuation into Wyoming |
| Butte | Belle Fourche | 9.919 | 15.963 | US 85 – Spearfish, Belle Fourche | |
| Lawrence | North Lawrence | 27.267– 27.371 | 43.882– 44.049 | I-90 west / US 14 west – Spearfish | Western end of I-90/US 14 concurrency |
| Meade | Sturgis | 33.873– 34.294 | 54.513– 55.191 | I-90 east / US 14 east / US 14A west / SD 79 south – Rapid City, Deadwood, Lead | Eastern end of I-90/US 14 concurrency, eastern terminus of US 14A, western end of SD 79 concurrency |
| Meade | Southwest Meade | 39.319 | 63.278 | SD 79 north – Bear Butte State Park, Newell | Eastern end of SD 79 concurrency |
| Meade | Howes | 113.051 | 181.938 | SD 73 north – US 212, Faith | Western end of SD 73 concurrency |
| Ziebach | No major junctions | No major junctions | No major junctions | No major junctions | No major junctions |
| Haakon | East Haakon | 138.931 | 223.588 | SD 73 south – Phillip | Eastern end of SD 73 concurrency |
| Stanley | North Stanley–South Stanley line | 167.189 | 269.065 | SD 63 north / Lewis and Clark Trail / Native American Scenic Byway – Eagle Butte | Western end of SD 63 concurrency |
| Stanley | North Stanley–South Stanley line | 167.673 | 269.844 | US 14 west / SD 63 south – Phillip | Western end of US 14 concurrency, eastern end of SD 63 concurrency |
| Stanley | Fort Pierre | 204.473 | 329.067 | SD 1806 north – Oahe Dam | Western end of SD 1806 concurrency |
| Stanley | Fort Pierre | 205.362 | 330.498 | US 83 south / SD 1806 south / Lewis and Clark Trail / Native American Scenic Byway | Western end of US 83 concurrency, eastern end of SD 1806 concurrency |
| Hughes | Pierre | 206.804 | 332.819 | US 14 east / US 83 north / Lewis and Clark Trail / US 14 Truck begins / US 83 Truck begins | US 14 Truck & US 83 Truck begins, eastern end of US 14/US 83 concurrency |
| Hughes | Pierre | 208.796 | 336.025 | US 14 Truck east / US 83 Truck north | Eastern end of US 14 Truck & US 83 Truck concurrency |
| Hyde | Crow Creek | 254.528 | 409.623 | SD 47 north – Highmore | Northern end of SD 47 concurrency |
| Buffalo | Fort Thompson | 266.869 | 429.484 | SD 47 south / Lewis and Clark Trail / Native American Scenic Byway – Fort Thompson, Big Bend Dam | Southern end of SD 47 concurrency |
| Buffalo | Fort Thompson | 267.812 | 431.002 | SD 249 south – Big Bend Dam | Northern terminus of SD 249 |
| Buffalo | Crow Creek | 272.369 | 438.335 | SD 50 east / Lewis and Clark Trail / Native American Scenic Byway – Chamberlain | Western terminus of SD 50 |
| Buffalo | Elvira Township | 289.300 | 465.583 | SD 45 – Gann Valley, Miller | |
| Jerauld | Wessington Springs Township | 316.095 | 508.706 | US 281 to I-90 / US 14 | |
| Sanborn | Woonsocket–Silver Creek township line | 328.326 | 528.389 | SD 37 north – Huron | Western end of SD 37 concurrency |
| Sanborn | Union Township | 338.415 | 544.626 | SD 37 south – Mitchell | Eastern end of SD 37 concurrency |
| Miner | Roswell Township | 356.352 | 573.493 | SD 25 south – Epiphany | Western end of SD 25 concurrency |
| Miner | Howard Township | 362.381 | 583.196 | SD 25 north – DeSmet | Eastern end of SD 25 concurrency |
| Miner | Clearwater Township | 370.445 | 596.173 | US 81 south – Salem | Western end of US 81 concurrency |
| Lake | Madison | 383.519 | 617.214 | US 81 north – Arlington | Eastern end of US 81 concurrency |
| Lake | Lake View Township | 387.529 | 623.667 | SD 19 south – Humboldt | Northern terminus of SD 19 |
| Moody | Egan Township | 402.961– 403.153 | 648.503– 648.812 | I-29 – Sioux Falls, Brookings | |
| Moody | Lone Rock Township | 419.010 | 674.331 | MN 30 east – Pipestone | Continuation into Minnesota |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus ||||||