South Dakota Highway 50
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Route of SD 50 (in red) | ||||
| Route information | ||||
| Defined by SDCL §31-4-170 | ||||
| Maintained by SDDOT | ||||
| Length: | 212.421 mi[1] (341.858 km) | |||
| Existed: | 1926 – present | |||
| Major junctions | ||||
| West end: |
 SD 34 east of Fort Thompson | |||
| East end: |
 Iowa 3 near Richland | |||
| Location | ||||
| Counties: | Buffalo, Brule, Charles Mix, Bon Homme, Yankton, Clay, Union | |||
| Highway system | ||||
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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
South Dakota 50 was designated on the route known as the Sunshine Highway. When it was created in the 1920s, it ran the entire length of southern South Dakota, from the Wyoming border west of Edgemont, to the Iowa border at Sioux City.
When U.S. Highway 18 was designated in the late 1920s, it replaced the SD 50 designation from the Wyoming border at Ravinia (east of Lake Andes). SD 50 continued in southeast South Dakota.
Around 1940, SD 50 was extended northwest of its old terminus. It assumed a portion of alignment of South Dakota Highway 45 through Geddes, and South Dakota Highway 47 through Academy; the northern terminus became U.S. Highway 16 near Pukwana.
Around 1950, the east terminus was rerouted. At U.S. Highway 77 (with which it had previously shared a dual alignment to Sioux City), SD 50 was extended east to the Iowa border.
In 1976, the northwest 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[1] | km | Destinations | Notes |
|---|---|---|---|---|---|
| Buffalo | | 0.000 | 0.000 | SD 34 | Western terminus |
| Brule | Chamberlain | 20.145 | 32.420 |  I-90 Bus. west | Western end of BL I-90 concurrency |
| 23.331– 23.450 | 37.548– 37.739 |  I-90 west / I-90 Bus. | Eastern terminus of BL I-90, western end of I-90 concurrency, exit 265. | ||
| | 29.642– 30.237 | 47.704– 48.662 | I-90 east | Eastern end of I-90 concurrency, exit 272. | |
| Charles Mix | | 61.986 | 99.757 |  SD 44 west | Western end of SD 44 concurrency |
| | 64.074 | 103.117 |  SD 1804 south | ||
| Platte | 72.070 | 115.985 |  SD 45 north | Southern terminus of SD 45 | |
| | 78.999 | 127.137 | SD 44 east | Eastern end of SD 44 concurrency | |
| | 93.827 | 151.000 | SD 1804 south | ||
| Lake Andes | 102.714 | 165.302 |   US 18 west / US 281 south | Western end of US 18/US 281 concurrency | |
| | 112.611 | 181.230 | US 18 east / US 281 north | Eastern end of US 18/US 281 concurrency | |
| Wagner | 117.904 | 189.748 |  SD 46 west | Western end of SD 46 concurrency | |
| | 126.743 | 203.973 | SD 46 east | Eastern end of SD 46 concurrency | |
| Bon Homme | | 137.056 | 220.570 |  SD 37 north | Western end of SD 37 concurrency |
| | 141.175 | 227.199 | SD 37 south | Eastern end of SD 37 concurrency | |
| | 150.725 | 242.568 |  SD 25 north | Southern terminus of SD 25 | |
| | 156.817 | 252.372 |  SD 52 west | Western end of SD 52 concurrency | |
| Yankton | | 161.701 | 260.233 | SD 52 east | Eastern end of SD 52 concurrency |
| | 164.738 | 265.120 |  SD 153 south | Northern terminus of SD 153 | |
| | 165.322 | 266.060 |  SD 314 east | Western terminus of SD 314 | |
| Yankton | 169.768 | 273.215 |  US 81 north | Northern end of US 81 concurrency | |
| 172.435 | 277.507 | US 81 south / SD 52 west | Eastern terminus of SD 52, southern end of US 81 concurrency | ||
| Clay | | 194.864 | 313.603 |   SD 50 Bus. east | Western terminus of SD 50 Bus. |
| Vermillion | 196.882 | 316.851 |  SD 19 | ||
| | 197.238 | 317.424 | SD 50 Bus. west | Eastern terminus of SD 50 Bus. | |
| Union | | 202.894– 203.069 | 326.526– 326.808 |  I-29 – Sioux City, IA, Sioux Falls | I-29 exit 26. |
| | 209.632 | 337.370 |  SD 11 south | Northern terminus of southern segment of SD 11 | |
| Plymouth | | 212.421 | 341.858 | Iowa 3 east | Continuation into Iowa |
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References
- 1 2 "State Highway Log: Mitchell Region" (PDF). South Dakota Department of Transportation. January 2012. Retrieved 2013-12-23.