Interstate 29

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US 12 at I-29 - Summit, SD
Interstate 29 traverses open prairie land throughout most of northeastern South Dakota. This view looks at the freeway north from the U.S. 12 overpass near Summit. 06/17/15

Interstate 29 travels 252.515 miles through eastern reaches of South Dakota between Sioux City, Iowa and North Dakota. The freeway replaced U.S. 77 from Iowa north to South Dakota 28 west of Toronto, and overlays the U.S. 81 corridor north of Watertown. The freeway expands to eight lanes in stretches through Sioux Falls.

Interstate 29 South Dakota Guides

The first portion of I-29 completed in South Dakota was a section in Sioux Falls between Russell Street and 60th Street North in the late 1950s.1 This stretch doubled as SD 38. Subsequent segments opened northward to SD 35 by Lone Tree and south to Sioux City, Iowa by 1965. Completion of the route northward from SD 34 to U.S. 14 outside Brookings occurred by 1971. The final portion of I-29 in South Dakota constructed was the piece between Exit 224 / Peever and Exit 246 with U.S. 81 at New Effington.

Interstate 29 extending north to SD 34. 1966 South Dakota Highway Map.
Interstate 29 ending at U.S. 14 Bypass outside Brookings. 1971 South Dakota Highway Map.
The final portion of Interstate 29 completed between Peever and New Effington. 1982 South Dakota Highway Map.

When Interstate 29 was completed in 1983, South Dakota was the fifth state to complete its portion of the Interstate Highway System.2

US 12 at I-29 - Summit, SD
Terrain changes associated with the Coteau des Prairies plateau appear along Interstate 29 in northeastern South Dakota. The plateau was formed between two streams of glacial ice during the Wisconsinan glaciation period. 06/17/15

Interstate 29 Business Routes

Interstate 29 sees four business routes in South Dakota. Unsigned Business Spur I-29P connects I-29 with North Sioux City. A state-maintained business loop follows northward from I-29 at the city of Elk Point. Sioux Falls sees a locally maintained Business Spur for I-29 along SD 42.

The Brookings Business Spur for I-29 is signed only from the freeway mainline at Exit 132. The route running west concurrently with U.S. 14 along 6th Street is unsigned otherwise.

Interstate 29 scenes
258th Street west meets Interstate 29 at a diamond interchange (Exit 86) north of Sioux Falls. The city of Crooks is a 1.9 mile drive away via CR 130 west and 470th Avenue (CR 137) north. Photo taken 04/20/07.
41st Street constitutes a heavily developed commercial arterial west from SD 115 (Minnesota Avenue) to Interstate 29 in south Sioux Falls. Photo taken 08/13/16.
41st Street west at the southbound entrance ramp to Interstate 29. Heading south, I-29 continues to I-229 and Tea en route to Sioux City, Iowa. Photo taken 04/20/07.

  1. The Unofficial South Dakota Highways Page: Highways 1 to 30.
  2. South Dakota Department of Transportation. (2016, June 29). Fun Fact: South Dakota was the fifth state in the nation to complete its portion of the Interstate Highway System. Starting in 1964 and averaging 50 miles constructed each year, 1-90 was finished in 1976 and 1-29 was completed in 1983 [Facebook update]. Retrieved from

Photo Credits:

04/20/07, 08/13/16 by AARoads

Connect with:
Interstate 90
Interstate 229
U.S. 14
Highway 50

Page Updated 02-17-2020.