 Interstate 29 | ||||
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 I-29 highlighted in red | ||||
| Route information | ||||
| Maintained bySDDOT | ||||
| Length | 252.50 mi[1] (406.36 km) | |||
| NHS | Entire route | |||
| Major junctions | ||||
| South end |  I-29 atIowa state line | |||
| Major intersections | ||||
| North end |  I-29 /US 81 atNorth Dakota state line | |||
| Location | ||||
| Country | United States | |||
| State | South Dakota | |||
| Counties | Union,Lincoln,Minnehaha,Moody,Brookings,Deuel,Hamlin,Codington,Grant,Roberts | |||
| Highway system | ||||
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Interstate 29 (I-29) is a north–southInterstate Highway in the midwesternUnited States. In the state ofSouth Dakota, I-29 traverses on the eastern side of the state from theIowa border nearSioux City to theNorth Dakota border nearNew Effington. On its route, I-29 passes through western portions ofSioux Falls, the state's largest city. It travels 252.5 miles (406.4 km) in the state, the longest stretch of any of the four states through which it passes.[1]I-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 I-29 is defined in South Dakota Consolidated Laws § 31-4-152.[2] All of I-29 in South Dakota is included in theNational Highway System,[3] a system of highways important to the nation's defense, economy, and mobility.[4] 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.[5]
The speed limit on I-29 in South Dakota is 80 mph (130 km/h) on most segments, but 65 mph (105 km/h) in Dakota Dunes and North Sioux City from the Iowa state line to exit 4, in Tea from exit 73 to exit 75, and in Sioux Falls from exit 75 to exit 84.
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I-29 crosses fromIowa into South Dakota at theBig Sioux River and enters the state inUnion County. Exit 1, the highway's first exit in South Dakota, serves unincorporatedDakota Dunes.North Sioux City, the first city the highway enters in the state, can be accessed from exits 2 and 4. At exit 9 is the next community,Jefferson.Highway 105 (SD 105) formerly ran parallel to I-29, with southern terminus at exit 2 and northern terminus at exit 9. North of Jefferson, I-29 has a business loop inElk Point. This business loop also serves the southern terminus ofSD 11, a state route that runs parallel to I-29 through much of southern South Dakota. Farther north of Elk Point, the route runs northwest until its interchange withSD 50 at exit 26. This exit serves the cities ofVermillion andYankton. After this exit, the highway curves north and heads forBeresford. Five miles (8.0 km) north at exit 31, the highway intersectsSD 48. I-29 has one exit in Beresford, exit 47 servingSD 46, just after leaving Union County and enteringLincoln County. Beginning at exit 59, the highway runsconcurrent withU.S. Route 18 (US 18). At exit 62, the concurrency with US 18 ends as US 18 branches to the east to serveCanton.[6]
North of Canton, I-29 begins to serve suburbs ofSioux Falls. Exit 71 servesHarrisburg and exit 73 servesTea. 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 servesI-229, a short auxiliary route that circles through the southern and eastern portions of the city. Just north of this interchange, I-29 entersMinnehaha County, the most populous county in South Dakota. At exit 77, I-29 shares an interchange with 41st Street. Adiverging-diamond interchange is to be constructed at this interchange, and will be completed in the summer of 2024.[7] At exit 79, the highway shares an interchange withSD 42, known as 12th Street. This exit, asingle-point urban interchange, serves downtown Sioux Falls. Exit 81 serves Russell Street, which leads to the newDenny Sanford PREMIER Center and theSioux Falls Arena. At exit 83, I-29 intersectsSD 38, also known as 60th Street North, which serves theSioux Falls Regional Airport. Just north of the Sioux Falls city limits at exits 84A and 84B, acloverleaf interchange, I-29 reachesI-90, the only other two-digit Interstate in South Dakota. Exit 84A to I-90 east leads to the suburb ofBrandon. Two miles (3.2 km) north of the interchange with I-90, the highway reaches exit 86, which servesRenner andCrooks, the two northernmost suburbs of Sioux Falls.[6]
After leaving the Sioux Falls area, I-29 continues north towardBrookings. The highway serves theEROS Data Center andUnited States Geological Survey nearBaltic. The highway then continues north and intersects the northern terminus ofSD 115 west ofDell Rapids. This is I-29's last exit before leavingMinnehaha County and enteringMoody County. The highway continues due north to an interchange withSD 34 nearMadison. Just five miles (8.0 km) north of here, the route shares an interchange withSD 32, a highway that serves nearbyFlandreau, South Dakota. The highway has a rest stop north of the Flandreau exit before enteringBrookings County. The highway's first exit in Brookings County, servesSD 324. After this interchange, I-29 entersBrookings and has two exits in the city. The first is an interchange withUS 14 at exit 132. This exit is also a signed business spur of I-29. Exit 133 serves the bypass route of US 14, signed as "US 14B". After these exits, the highway continues north towardWatertown.[6]
Before leavingBrookings County and enteringDeuel County, I-29 intersectsSD 30. About 10 miles (16 km) north of here, the highway servesSD 28. After this interchange, the highway turns northwest en route toWatertown. Early planning of this segment of I-29 had the route passing just east of Kranzburg, or about nine miles (14 km) east of Watertown. A past president of the Watertown Chamber of Commerce contacted Francis Case, a South Dakota Senator, in an effort to get I-29 routed closer to Watertown. The effort was successful; the westward alignment became known locally as the Case Bend. East ofCastlewood, I-29 intersectsSD 22 before enteringHamlin 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 enteringCodington County. The highway curves to the north one mile (1.6 km) before its first exit in Codington County, which is exit 177, servingUS 212 in the southeastern portion of Watertown.[6]
I-29 intersectsUS 81 at exit 180, just northeast of Watertown, and the two routes become concurrent all the way toManvel, North Dakota. Near theCodington–Grant county line, I-29 intersectsSD 20. The highway has one exit in Grant County forTwin Brooks, though this road is not a signed highway. EnteringRoberts County, I-29 has an interchange atSummit withUS 12, for access toAberdeen andMilbank. The highway heads northeast after this interchange. West ofWilmot, the highway intersectsSD 15. Shortly after this exit, the highway turns to the north again. Just east ofSisseton, I-29 has an interchange withSD 10 then curves northeast. Near the small town ofNew Effington, the highway curves north and has its last exit in South Dakota at exit 246. This exit servesSD 127. North of this final exit, I-29 turns northeast and entersRichland County,North Dakota, next to the Dakota Magic Casino and Hotel resort. At the state border is aparclo interchange entirely on the North Dakota side serving the casino–hotel.[6]
Jefferson Lines provides intercity bus service along the length of I-29 in South Dakota serving five communities along the route with a major transfer point at theSioux Falls Bus Station.[8]
No freeway was originally designated betweenSioux Falls andFargo, North Dakota. In 1957, the segment of I-29 from Fargo to the Canadian border was considered for designation asInterstate 31 (I-31).[9] However, in 1958, it was decided to connect the two Interstates between Sioux Falls and Fargo. The entire freeway fromKansas City, Missouri, to the Canadian border was then built and signed as I-29.[10]
A 19.5-mile (31.4 km) section betweenWorthing and SD 38 west of Sioux Falls was opened in October 1960.[11] In September 1961, I-29 was extended across theBig Sioux River from Iowa to South Dakota. On April 1, 1962, some of the northbound directional spans collapsed into the Big Sioux River at the Iowa state line as a result of flooding andbridge scour.[12][13][14] On September 30, 1962, an 84-mile (135 km) section of I-29 between Sioux City and Sioux Falls was dedicated and opened to traffic.[15]
By 1967, I-29 had been constructed from the Iowa border to the exit for SD 34.[16] I-229, an auxiliary route for the highway bypassing Sioux Falls, was completed in 1962.[17]
An additional interchange inBrookings was opened on August 24, 2023.[18]
By 2033, theSouth Dakota Department of Transportation (SDDOT) is planning to upgrade the interchange withI-229. SDDOT also plans to install an interchange with 85th Street inSioux Falls, as well as a 69th Street overpass, turning a trumpet interchange into a redesignedtri-stack interchange.[19]
| County | Location | mi[20][21] | km | Exit | Destinations | Notes | ||
|---|---|---|---|---|---|---|---|---|
| Union | Big Sioux Township | 0.00 | 0.00 |  I-29 south –Sioux City | Continuation into Iowa | |||
| Dakota Dunes | 0.98 | 1.58 | 1 | Dakota Dunes | Parclo interchange | |||
| North Sioux City | 2.48 | 3.99 | 2 | North Sioux City | FormerlySD 105 | |||
| 4.35 | 7.00 | 4 | North Sioux City,McCook Lake | |||||
| Jefferson Township | 9.50 | 15.29 | 9 | Jefferson | FormerlySD 105 | |||
| Elk Point Township | 15.78 | 25.40 | 15 |   I-29 BL north –Elk Point | I-29 BL only marked northbound | |||
| 18.30 | 29.45 | 18 |  I-29 BL south –Elk Point,Burbank | Parclo interchange, I-29 BL only marked southbound | ||||
| Brule Township | 26.70 | 42.97 | 26 |  SD 50 –Vermillion,Yankton | Also access toUniversity of South Dakota | |||
| Spink Township | 31.27 | 50.32 | 31 |   SD 48 east –Spink,Akron IA | Also access toUnion Grove State Park | |||
| Emmet Township | 38.32 | 61.67 | 38 | Volin | ||||
| Prairie Township | 42.31 | 68.09 | 42 | Alcester,Wakonda | ||||
| Lincoln | Beresford | 47.30 | 76.12 | 47 |  SD 46 –Beresford,Irene | |||
| Pleasant Township | 50.31 | 80.97 | 50 | Centerville,Hudson | ||||
| Pleasant–Lincoln township line | 53.32 | 85.81 | 53 | Viborg | ||||
| Lincoln Township | 56.33 | 90.65 | 56 | Fairview | Also access toNewton Hills State Park | |||
| Lincoln–Lynn township line | 59.33 | 95.48 | 59 |   US 18 west –Davis,Hurley | Southern end of US 18 concurrency | |||
| Lynn Township | 62.35 | 100.34 | 62 |  US 18 east –Canton | Northern end of US 18 concurrency | |||
| 64.33 | 103.53 | 64 |  SD 44 –Worthing,Lennox | |||||
| La Valley Township | 68.35 | 110.00 | 68 | Lennox,Parker | ||||
| Tea | 71.36 | 114.84 | 71 | Harrisburg,Tea | ||||
| 73.38 | 118.09 | 73 |  CR 106 –Tea | Single-point urban interchange (SPUI) | ||||
| Sioux Falls | 74.38 | 119.70 | 74 | 85th Street | Future diverging diamond interchange; to begin construction in 2025 | |||
| 75.19 | 121.01 | 75 |   I-229 north –Sioux Falls | Trumpet interchange; I-229 exits 1A-B southbound. | ||||
| Minnehaha | 77.26 | 124.34 | 77 | 41st Street | Diverging diamond interchange; Also access toAugustana University,University of Sioux Falls | |||
| 78.12 | 125.72 | 78 | 26th Street / Louise Avenue | |||||
| 79.26 | 127.56 | 79 | 12th Street – Downtown | SPUI; Also access toGreat Plains Zoo,USS South Dakota Battleship Memorial,Washington Pavilion of Arts and Science | ||||
| 80.29 | 129.21 | 80 | Madison Street –Sioux Empire Fairgrounds | SPUI | ||||
| 81.32 | 130.87 | 81 | Russell Street / Maple Street –Denny Sanford PREMIER Center,Sioux Falls Arena and Convention Center | Parclo interchange having three northbound entrances: two from Russell St., one from Maple St; Also access toSioux Falls Bus Station | ||||
| 82.41 | 132.63 | 82 | Benson Road –Sioux Falls, Sanford Pentagon/Sports Complex | SPUI | ||||
| 83.38 | 134.19 | 83 |    SD 38 west (60th Street North) –Sioux Falls Regional Airport | Parclo interchange | ||||
| Mapleton Township | 84.15 | 135.43 | 84 |  I-90 –Albert Lea,Rapid City | Signed as exits 84A (east, Albert Lea) and 84B (west, Rapid City);cloverleaf interchange; I-90 exits 396A-B | |||
| 86.40 | 139.05 | 86 | Renner,Crooks | |||||
| Lyons–Burk township line | 94.49 | 152.07 | 94 | Baltic,Colton,Lyons,US Geological Survey/EROS | Colton only signed northbound | |||
| Burk Township | 98.47 | 158.47 | 98 |   SD 115 south –Dell Rapids,Chester,Colton | SD 115 and Colton only signed southbound, Chester only signed northbound | |||
| Moody | Enterprise Township | 104.81 | 168.68 | 104 | Trent,Chester | Chester only signed southbound | ||
| Egan Township | 109.83 | 176.75 | 109 |  SD 34 –Madison,Colman | Also access toDakota State University,Lake Herman State Park | |||
| Clare Township | 114.82 | 184.78 | 114 |  SD 32 east –Flandreau | ||||
| Riverview Township | 121.83 | 196.07 | 121 | Nunda,Ward | ||||
| Brookings | Trenton Township | 127.80 | 205.67 | 127 |  SD 324 east –Elkton,Sinai | Western terminus ofSD 324 | ||
| Brookings | 130.79 | 210.49 | 130 | 20th Street South,Brookings | Opened August 24, 2023;[22][18] Brookings only signed northbound | |||
| 132.79 | 213.70 | 132 |    I-29 BS west /US 14 (6th Street) –Brookings,Huron | Eastern terminus of I-29 Business Spur; Also access toSouth Dakota State University,Municipal Airport; 6th Street only signed southbound | ||||
| 133.78 | 215.30 | 133 |  US 14 Byp. (18th Street) –Volga,Arlington | Also access toSouth Dakota State University,De Smet-Home ofLaura Ingalls Wilder; 18th Street only signed northbound | ||||
| Afton Township | 140.77 | 226.55 | 140 |  SD 30 –White,Bruce | Also access toOakwood Lakes State Park | |||
| Deuel | Blom Township | 150.87 | 242.80 | 150 |    SD 15 north /SD 28 –Toronto,Estelline | SD 15 only signed northbound | ||
| Hidewood Township | 157.63 | 253.68 | 157 | Brandt | ||||
| Havana Township | 164.53 | 264.79 | 164 |  SD 22 –Castlewood,Clear Lake | ||||
| Hamlin | No major junctions | |||||||
| Codington | Watertown | 177.93 | 286.35 | 177 |  US 212 –Watertown,Kranzburg | Also access toRedlin Art Center,Lake Area Technical Institute,Mount Marty University-Watertown Campus,Sandy Shore Recreation Area, Pelican Lake Recreation Area | ||
| Elmira Township | 180.94 | 291.19 | 180 |  US 81 south –Watertown | Southern end of US 81 concurrency; Also access toBramble Park Zoo,Municipal Airport, US 81 only signed southbound | |||
| Rauville Township | 185.95 | 299.26 | 185 | Waverly | ||||
| Germantown Township | 193.02 | 310.64 | 193 |  SD 20 –South Shore,Stockholm | ||||
| Grant | Farmington Township | 201.05 | 323.56 | 201 | Twin Brooks | |||
| Roberts | Summit Township | 207.29 | 333.60 | 207 |  US 12 –Aberdeen,Milbank | Also access toNorthern State University,Summit,Webster, Blue Dog State Fish Hatchery,Waubay National Wildlife Refuge | ||
| Spring Grove Township | 213.87 | 344.19 | 213 | SD 15 –Wilmot | Also access toHartford Beach State Park | |||
| Agency Township | 224.02 | 360.53 | 224 | Peever | Also access toSisseton-Wahpeton Oyate Tribal Headquarters andCommunity College, Pickerel Lake Recreation Area | |||
| Grant Township | 232.07 | 373.48 | 232 |  SD 10 –Sisseton,Browns Valley | Also access toRoy Lake State Park,Fort Sisseton State Park | |||
| Hart Township | 242.02 | 389.49 | 242 | No name exit | ||||
| Lien Township | 246.42 | 396.57 | 246 |  SD 127 –New Effington,Rosholt | Also access toSica Hollow State Park | |||
| Victor Township | 252.50 | 406.36 |  I-29 north /US 81 north –Fargo | Continuation into North Dakota | ||||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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Media related toInterstate 29 in South Dakota at Wikimedia Commons Interstate 29 | ||
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