# South Dakota Highway 50

South Dakota Highway 50 (SD 50) is a state route serving south central and southeast South Dakota. The current alignment begins at the junction of South Dakota Highway 34 at "Lee's Corner" east of Fort Thompson, and ends at the Iowa border near Richland, where it continues as Iowa Highway 3. It is about 212 miles (341 km) in length.

## History

SD 50 was designated on the route known as the Sunshine Highway. When it was formed in the 1920s, it traveled the entire length of southern South Dakota, from the Wyoming state line west of Edgemont, to the Iowa state line at Sioux City.
When U.S. Route 18 (US 18) was designated in the late 1920s, it replaced the SD 50 designation from the Wyoming state line at Ravinia (east of Lake Andes). SD 50 continued in southeast South Dakota.
Around 1940, SD 50 was extended northwest of its former terminus. It assumed a portion of alignment of SD 45 through Geddes, and SD 47 through Academy; the northern terminus became US 16 near Pukwana.
Around 1950, the eastern terminus was rerouted. At US 77 (with which it had previously shared a concurrency to Sioux City), SD 50 was extended east to the Iowa state line.
In 1975, the northwestern terminus was again extended. It was routed west to Chamberlain, then assumed a segment of SD 47 (which had been realigned west) to its new northern terminus at SD 34 east of Fort Thompson.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| Buffalo | Crow Creek | 0.000 | 0.000 | SD 34 / Lewis and Clark Trail / Native American Scenic Byway | Western terminus |
| Brule | Chamberlain | 20.145 | 32.420 | I-90 BL west | Western end of BL I-90 concurrency |
| Brule | Chamberlain | 23.331– 23.450 | 37.548– 37.739 | I-90 west / I-90 BL begins / Native American Scenic Byway begins | Eastern terminus of BL I-90, western end of I-90 concurrency, exit 265. |
| Brule | Red Lake Township | 29.642– 30.237 | 47.704– 48.662 | I-90 east | Eastern end of I-90 concurrency, exit 272. |
| Charles Mix | Castalia | 61.986 | 99.757 | SD 44 west | Western end of SD 44 concurrency |
| Charles Mix | Castalia | 64.074 | 103.117 | SD 1804 south | |
| Charles Mix | Platte | 72.070 | 115.985 | SD 45 north | Southern terminus of SD 45 |
| Charles Mix | Darlington–Clark township line | 78.999 | 127.137 | SD 44 east | Eastern end of SD 44 concurrency |
| Charles Mix | Jackson Township | 93.827 | 151.000 | SD 1804 south | |
| Charles Mix | Lake Andes | 102.714 | 165.302 | US 18 west / US 281 south / Lewis and Clark Trail | Western end of US 18/US 281 concurrency |
| Charles Mix | Plain Center–Bryan township line | 112.611 | 181.230 | US 18 east / US 281 north | Eastern end of US 18/US 281 concurrency |
| Charles Mix | Wagner | 117.904 | 189.748 | SD 46 west / Lewis and Clark Trail | Western end of SD 46 concurrency |
| Charles Mix | Lone Tree–Choteau Creek township line | 126.743 | 203.973 | SD 46 east | Eastern end of SD 46 concurrency |
| Bon Homme | Northwest Bon Homme | 137.056 | 220.570 | SD 37 north | Western end of SD 37 concurrency |
| Bon Homme | Southwest Bon Homme | 141.175 | 227.199 | SD 37 south / Lewis and Clark Trail | Eastern end of SD 37 concurrency |
| Bon Homme | Southeast Bon Homme | 150.725 | 242.568 | SD 25 north | Southern terminus of SD 25 |
| Bon Homme | Southeast Bon Homme | 156.817 | 252.372 | SD 52 west / Lewis and Clark Trail | Western end of SD 52 concurrency |
| Yankton | West Yankton | 161.701 | 260.233 | SD 52 east / Lewis and Clark Trail / SD 52 Truck begins | Eastern end of SD 52 concurrency |
| Yankton | West Yankton | 164.738 | 265.120 | SD 153 south – Gavin's Point Dam, Utica | Northern terminus of SD 153 |
| Yankton | West Yankton | 165.322 | 266.060 | SD 314 east | Western terminus of SD 314 |
| Yankton | Yankton | 169.768 | 273.215 | US 81 north – Freeman | Northern end of US 81 concurrency |
| Yankton | Yankton | 172.435 | 277.507 | US 81 south / SD 52 west / Lewis and Clark Trail / SD 52 Truck ends – Norfolk, NE | Eastern terminus of SD 52, southern end of US 81 concurrency |
| Clay | Vermillion Township | 194.864 | 313.603 | SD 50 Bus. east – Vermillion Business District, Newcastle, NE | Western terminus of SD 50 Bus. |
| Clay | Vermillion | 196.882 | 316.851 | SD 19 – Vermillion, Newcastle, NE, Centerville | Vermillion only signed eastbound; Newcastle, NE only signed westbound |
| Clay | Fairview Township | 197.238 | 317.424 | SD 50 Bus. west | Eastern terminus of SD 50 Bus. |
| Union | Brule Township | 202.894– 203.069 | 326.526– 326.808 | I-29 – Elk Point, Beresford | I-29 Exit 26. |
| Union | Brule Township | 209.632 | 337.370 | SD 11 south – Elk Point | Northern terminus of southern segment of SD 11 |
| Plymouth | Richland Township | 212.421 | 341.858 | Iowa 3 east | Continuation into Iowa |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus ||||||