South Dakota Highway 50

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Highway 50 marker

Highway 50
Route of SD 50 (in red)
Route information
Defined by SDCL §31-4-170
Maintained by SDDOT
Length212.421 mi[1] (341.858 km)
Major junctions
West end SD 34 east of Fort Thompson
East end Iowa 3 near Richland
CountiesBuffalo, Brule, Charles Mix, Bon Homme, Yankton, Clay, Union
Highway system
  • South Dakota Highways
SD 49SD 52

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.


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[edit]

Buffalo0.0000.000 SD 34Western terminus
BruleChamberlain20.14532.420 I-90 Bus. westWestern end of BL I-90 concurrency
I-90 west / I-90 Bus.Eastern terminus of BL I-90, western end of I-90 concurrency, exit 265.
I-90 eastEastern end of I-90 concurrency, exit 272.
Charles Mix61.98699.757 SD 44 westWestern end of SD 44 concurrency
64.074103.117 SD 1804 south
Platte72.070115.985 SD 45 northSouthern terminus of SD 45
78.999127.137 SD 44 eastEastern end of SD 44 concurrency
93.827151.000 SD 1804 south
Lake Andes102.714165.302 US 18 west / US 281 southWestern end of US 18/US 281 concurrency
112.611181.230 US 18 east / US 281 northEastern end of US 18/US 281 concurrency
Wagner117.904189.748 SD 46 westWestern end of SD 46 concurrency
126.743203.973 SD 46 eastEastern end of SD 46 concurrency
Bon Homme137.056220.570 SD 37 northWestern end of SD 37 concurrency
141.175227.199 SD 37 southEastern end of SD 37 concurrency
150.725242.568 SD 25 northSouthern terminus of SD 25
156.817252.372 SD 52 westWestern end of SD 52 concurrency
Yankton161.701260.233 SD 52 eastEastern end of SD 52 concurrency
164.738265.120 SD 153 southNorthern terminus of SD 153
165.322266.060 SD 314 eastWestern terminus of SD 314
Yankton169.768273.215 US 81 northNorthern end of US 81 concurrency
172.435277.507 US 81 south / SD 52 westEastern terminus of SD 52, southern end of US 81 concurrency
SD 50 Bus. east
Western terminus of SD 50 Bus.
Vermillion196.882316.851 SD 19
SD 50 Bus. west
Eastern terminus of SD 50 Bus.
I-29 – Sioux City, IA, Sioux FallsI-29 exit 26.
209.632337.370 SD 11 southNorthern terminus of southern segment of SD 11
Plymouth212.421341.858 Iowa 3 eastContinuation into Iowa
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b "State Highway Log: Mitchell Region" (PDF). South Dakota Department of Transportation. January 2012. Retrieved 2013-12-23.

External links[edit]

Route map:

KML is from Wikidata