Interstate 29 in South Dakota
|Maintained by SDDOT|
|Length:||252.50 mi (406.36 km)|
|South end:||I-29 at Iowa state line|
| US 18 concurrency near Canton
I-229 in Sioux Falls
I-90 near Sioux Falls
US 14 in Brookings
US 212 in Watertown
US 81 near Watertown
US 12 near Summit
|North end:||I-29 / US 81 at North Dakota state line|
Interstate 29 (I-29) is a north–south Interstate Highway in the midwestern United States. In the U.S. state of South Dakota, I-29 traverses on the eastern side of the state from the Iowa border near Sioux City to the North Dakota border near New Effington. On its route, I-29 passes through western portions of Sioux Falls, the state's largest city. Interstate 229, the highway's lone auxiliary route in South Dakota, serves as a bypass around southern and eastern Sioux Falls.
The South Dakota section of Interstate 29 is defined in South Dakota Consolidated Laws § 31-4-152. All of I-29 in South Dakota is included in the National Highway System, a system of highways important to the nation's defense, economy, and mobility. Average daily traffic volume on I-29 in South Dakota is relatively low by interstate highway standards. Most segments of I-29 outside of Sioux Falls receive between 5,000 and 20,000 vehicles per day, with numbers as high as 50,000 being reported in Sioux Falls.
The speed limit on I-29 in South Dakota is 75 miles per hour (120 km/h) on most segments, but 65 mph (105 km/h) in Sioux Falls from exit 75 to exit 84.
Sioux City to Sioux Falls
Interstate 29 crosses from Iowa into South Dakota at the Big Sioux River and enters the state in Union County. Exit 1, the highway's first exit in South Dakota, serves unincorporated Dakota Dunes. North Sioux City, the first city the highway enters in the state, can be accessed from exit 2. At exit 5, the highway intersects its first state highway, SD 105. North of here, I-29 has a business loop in Elk Point. This business loop also serves the southern terminus of SD 11, a state route that runs parallel to Interstate 29 through much of southern South Dakota. Farther north of Elk Point, the route runs northwest until its interchange with SD 50 at exit 26. This exit serves the cities of Vermillion and Yankton. Five miles (8.0 km) north of here, the highway intersects SD 48. After this exit, the highway curves north and heads for Beresford. I-29 has one exit in Beresford, serving SD 46, just after leaving Union County and entering Lincoln County. Beginning at exit 59, the highway runs concurrent with US 18. At exit 62, the concurrency with US 18 ends as US 18 branches to the east to serve Canton.
North of Canton, I-29 begins to serve suburbs of Sioux Falls. Exit 71 serves Harrisburg and exit 73 serves Tea. Two miles (3.2 km) north of the Tea interchange, the interstate enters Sioux Falls, the largest city in South Dakota. The highway has eight exits in Sioux Falls. The first exit in the city serves Interstate 229, a short auxiliary route that circles through southern and eastern portions of the city. Just north of this interchange, I-29 enters Minnehaha County, the most populous county in South Dakota. At exit 79, the highway shares an interchange with SD 42, known as 12th Street. This exit serves downtown Sioux Falls and links to the eastern portion of the city and, indirectly, to the suburb of Brandon. Exit 81 serves Russell Street, which leads to the Sioux Falls Arena. At exit 83, I-29 intersects SD 38, also known as 60th Street North, which serves the Sioux Falls Regional Airport. Just north of the Sioux Falls city limits at exit 84, Interstate 29 reaches Interstate 90, the only other two-digit interstate in South Dakota. Two miles (3.2 km) north of the interchange with I-90 the highway reaches exit 86, which serves Renner and Crooks, the two northernmost suburbs of Sioux Falls.
Sioux Falls to North Dakota
After leaving the Sioux Falls area, Interstate 29 continues north toward Brookings. The highway serves the EROS Data Center and United States Geological Survey near Baltic. The highway then continues north and intersects the northern terminus of SD 115 west of Dell Rapids. This is I-29's last exit before leaving Minnehaha County and entering Moody County. The highway continues due north to an interchange with SD 34 near Madison. Just five miles (8.0 km) north of here, the route shares an interchange with SD 32, a highway that serves nearby Flandreau, South Dakota. The highway has a rest stop north of the Flandreau exit before entering Brookings County. The highway's first exit in Brookings County, serves SD 324. After this interchange, Interstate 29 enters Brookings and has two exits in the city. The first is an interchange with US 14 at exit 132. This exit is also a signed business spur of I-29. Exit 133 serves the business route of US 14. This exit is signed on the northbound route as "US 14B." After these exits, the highway continues north toward Watertown.
Before leaving Brookings County and entering Deuel County, Interstate 29 intersects the western terminus of SD 30. About ten miles (16 km) north of here, the highway serves SD 15 and SD 28. After this interchange, the highway turns northwest en route to Watertown. East of Castlewood, I-29 intersects SD 22 before entering Hamlin County. The highway has no exits in Hamlin County, as it travels for only five miles (8.0 km) in the county, merely passing through the northeast corner of it before entering Codington County. The highway's first exit in Codington County is exit 177, which serves US 212 in the southeastern portion of Watertown. This is the route's only exit in the city.
Interstate 29 curves to the north after leaving Watertown. The highway intersects US 81 at exit 180, and the two routes become concurrent all the way to Manvel, North Dakota. Near the Codington-Grant county line, I-29 intersects SD 20. The highway has one exit in Grant County for Twin Brooks, though this road is not a signed highway. Entering Roberts County, I-29 has an interchange with US 12 near Summit. The highway heads northeast after this interchange. West of Wilmot, the highway intersects SD 15. Shortly after this exit, the highway turns to the north again. Just east of Sisseton, I-29 has an interchange with SD 10, then curves northeast. Near the small town of New Effington, the highway curves north and has its last exit in South Dakota at exit 246. This exit serves SD 127. North of this final exit, Interstate 29 turns northeast and enters Richland County, North Dakota.
No freeway was originally designated between Sioux Falls and Fargo, North Dakota. In 1957, the segment of Interstate 29 from Fargo to the Canadian border was considered for designation as Interstate 31. However, in 1958 it was decided to connect the two interstates between Sioux Falls and Fargo. The entire freeway from Kansas City, Missouri to the Canadian border was then built and signed as I-29.
In September 1961, I-29 was extended across the Big Sioux River from Iowa to South Dakota. On April 1, 1962, one of the directional spans on the bridge collapsed four feet due to flooding, but did not collapse.
By 1967, I-29 had been constructed from the Iowa border to the exit for South Dakota Highway 34. Interstate 229, an auxiliary route for the highway bypassing Sioux Falls, had been constructed as well.
Between now and 2033, the South Dakota Department of Transportation is planning to upgrade the interchange with Interstate 229. SDDOT also plans to install an interchange with 85th Street in Sioux Falls, as well as a 69th Street overpass.
||0.00||0.00||I-29 south||Continuation into Iowa|
|North Sioux City||2.48||3.99||2||North Sioux City|
|4.35||7.00||4||North Sioux City, McCook Lake|
|9.50||15.29||9||SD 105 south – Jefferson|
|Elk Point||15.78||25.40||15||I-29 Bus. north – Elk Point|
|18.30||29.45||18||I-29 Bus. south – Elk Point, Burbank|
|26.70||42.97||26||SD 50 – Vermillion, Yankton|
|31.27||50.32||31||SD 48 – Spink, Akron|
||Beresford||47.30||76.12||47||SD 46 – Beresford, Irene|
|59.33||95.48||59||US 18 west – Davis, Hurley||South end of US 18 concurrency|
|62.35||100.34||62||US 18 east – Canton||North end of US 18 concurrency|
|64.33||103.53||64||SD 44 – Worthing, Lennox|
|Sioux Falls||75.19||121.01||75||I-229 north|
|79.26||127.56||79||SD 42 (12th Street) – Downtown|
|80.29||129.21||80||Madison Street – Ellis|
|81.32||130.87||81||Russell Street, Maple Street – Sioux Falls Arena and Convention Center|
|83.38||134.19||83||SD 38 west (60th Street north) – Sioux Falls Regional Airport|
|84.15||135.43||84||I-90 – Albert Lea, Rapid City||Signed as exits 84A (east, Albert Lea) and 84B (west, Rapid City)|
|94.49||152.07||94||Baltic, United States Geological Survey, EROS Data Center, Colton, Lyons|
|98.47||158.47||98||SD 115 south – Dell Rapids, Colton|
|109.83||176.75||109||SD 34 – Madison, Colman, Egan|
|114.82||184.78||114||SD 32 – Flandreau|
|121.83||196.07||121||Nunda, Ward, Rest Area|
||127.80||205.67||127||SD 324 – Elkton, Sinai, Medary|
|Brookings||132.79||213.70||132||I-29 Bus. / US 14 – Brookings, Huron, Aurora, Bushnell|
US 14 Bus. – Volga, Arlington
|140.77||226.55||140||SD 30 – White, Bruce|
||150.87||242.80||150||SD 15 / SD 28 – Toronto, Estelline|
|164.53||264.79||164||SD 22 – Castlewood, Clear Lake|
||No major junctions|
||Watertown||177.93||286.35||177||US 212 – Watertown, Kranzburg|
|180.94||291.19||180||US 81 south – Watertown||South end of US 81 concurrency|
|193.02||310.64||193||SD 20 – South Shore, Stockholm|
||207.29||333.60||207||US 12 – Aberdeen, Milbank|
|213.87||344.19||213||SD 15 – Wilmot|
|232.07||373.48||232||SD 10 – Sisseton, Browns Valley|
|246.42||396.57||246||SD 127 – New Effington, Victor, Rosholt|
|252.50||406.36||I-29 north||Continuation into North Dakota|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- "Main Routes of the Eisenhower National System of Interstate and Defense Highways". Federal Highway Administration. Retrieved October 28, 2012.
- "South Dakota Codified Laws - § 31-4-152". South Dakota Legislature. Retrieved June 25, 2008.
- "National Highway System Map". South Dakota: Federal Highway Administration. Retrieved October 28, 2012.
- "The National Highway System". Federal Highway Administration. Retrieved October 28, 2012.
- "2011 Traffic Map". South Dakota Department of Transportation. Retrieved October 28, 2012.
- "Google Maps Overview of Interstate 29". Retrieved October 28, 2012.
- Official Route Numbering for the National System of Interstate and Defense Highways, August 14, 1957
- Official Route Numbering for the National System of Interstate and Defense Highways, June 27, 1958
- "Rain, storms follow weekend of storms; stir fears of floods". Lodi News-Sentinel. United Press International. April 2, 1962. p. 5. Retrieved September 8, 2010.
- "North Central 1967". Gousha. Retrieved November 4, 2012.
- "I-29 Corridor Study". Exit 73 through Exit 77: South Dakota Department of Transportation. Retrieved October 29, 2012.
- "State Highway Log". Mitchell Region: South Dakota Department of Transportation. Retrieved October 28, 2012.
- "State Highway Log". Aberdeen Region: South Dakota Department of Transportation. Retrieved October 28, 2012.
|South Dakota||Next state: