National Bridge Inventory: South Dakota

  • Of the 5,886 bridges in the state, 1,018, or 17.3 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 1,003 bridges classified as structurally deficient in 2017.
  • The deck area of structurally deficient bridges accounts for 9.7 percent of total deck area on all structures.
  • 2 of the structurally deficient bridges are on the Interstate Highway System. A total of 98.6 percent of the structurally deficient bridges are not on the National Highway System, which includes the Interstate and other key roads linking major airports, ports, rail and truck terminals.
  • 1,130 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,404 bridges at an estimated cost of $1.0 billion.
  • This compares to 2,556 bridges that needed work in 2017.

County Year Built Daily Crossings Type of Bridge Location
Brown 1954 19,426 Urban other principal arterial US012 over Moccasin Ck
Minnehaha 1979 18,174 Urban collector 49th Street over Big Sioux River
Hughes 1962 15,450 Urban other principal arterial US014 over Missouri Rv
Minnehaha 1912 10,163 Urban collector 8th Street over Big Sioux River
Minnehaha 1999 9,273 Urban other principal arterial Benson Road over Big Sioux Diversion
Minnehaha 1975 7,850 Urban collector 6th Street over Big Sioux River
Minnehaha 1964 5,995 Rural Interstate I090 W over Sd019
Codington 1974 4,868 Rural major collector 14th Ave. N, Wtn. over Big Sioux Rv
Codington 1941 4,837 Urban minor arterial 3rd Avenue NW over Big Sioux River
Pennington 1974 4,700 Urban collector Chapel Lane over Rapid Ck
Lyman 1970 3,790 Rural Interstate I090 W over US183
Minnehaha 1978 3,377 Rural major collector 478th Ave, Hwy 121 over Big Sioux River
Minnehaha 1961 3,300 Urban collector E 60th St N over I229
Edmunds 1974 2,766 Rural arterial US012 over Ck
Grant 1914 2,560 Urban local road 2nd Avenue over Bn Railroad
Pennington 1947 2,269 Rural arterial US385 over Horse Ck
Brown 1974 2,069 Urban collector 10th Avenue SE over Moccasin Creek
Lake 1937 1,900 Rural major collector 235 St over Silver Ck
Codington 1940 1,851 Rural major collector 455 Avenue over Mahoney Ck
Todd 1972 1,851 Rural major collector IRR BIA Rte 7 over Little White River
Minnehaha 1967 1,810 Rural minor collector 487th Ave, Hwy 103 over Beaver Creek
Minnehaha 1964 1,650 Rural minor collector 258th St, Hwy 130 over Split Rock Creek
Pennington 1972 1,650 Rural major collector Resevoir Road over Rapid Ck
Kingsbury 1952 1,520 Rural minor arterial Sd025 over Ck
Lawrence 1940 1,500 Rural minor collector I-90 Service Road over Crow Ck
Type of Bridge Number of Bridges Area of All Bridges
(sq. meters)
Daily Crossings on All Bridges Number of Structurally Deficient Bridges Area of Structurally Deficient Bridges
(sq. meters)
Daily Crossings on Structurally Deficient Bridges
Rural Interstate 332 199,306 1,798,838 2 1,434 9,785
Rural arterial 461 265,378 970,107 9 3,458 11,929
Rural minor arterial 531 243,771 664,288 11 14,209 7,850
Rural major collector 1,163 339,906 475,494 156 49,372 60,947
Rural minor collector 228 63,305 42,923 45 7,443 9,300
Rural local road 2,747 393,583 206,484 774 81,828 46,515
Urban Interstate 122 110,888 1,621,426 0 0 0
Urban freeway/expressway 8 10,892 68,478 0 0 0
Urban other principal arterial 77 95,739 809,537 3 13,383 44,149
Urban minor arterial 88 83,179 634,286 1 426 4,837
Urban collector 56 34,122 203,549 8 6,815 47,826
Urban local road 73 19,338 71,124 9 2,281 4,798
Total 5,886 1,859,408 7,566,534 1,018 180,649 247,936
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,266 $606 677,390 276,831
Widening & rehabilitation 6 $5 48,507 3,025
Rehabilitation 443 $191 170,440 132,022
Deck rehabilitation/replacement 49 $49 120,272 31,756
Other structural work 640 $168 237,043 117,199
Total 2,404 $1,019 1,253,652 560,832

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections. Cost estimates were downloaded by ARTBA on January 3, 2022.

Effective January 1, 2018, FHWA changed the definition of structurally deficient as part of the final rule on highway and bridge performance measures, published May 20, 2017 pursuant to the 2012 federal aid highway bill Moving Ahead for Progress in the 21st Century Act (MAP-21). Two measures that were previously used to classify bridges as structurally deficient are no longer used. This includes bridges where the overall structural evaluation was rated in poor or worse condition, or where the adequacy of waterway openings was insufficient.

The new definition limits the classification to bridges where one of the key structural elements—the deck, superstructure, substructure or culverts, are rated in poor or worse condition. During inspection, the conditions of a variety of bridge elements are rated on a scale of 0 (failed condition) to 9 (excellent condition). A rating of 4 is considered “poor” condition.

Cost estimates have been derived by ARTBA, based on 2020 average bridge replacement costs for structures on and off the National Highway System, published by FHWA. Bridge rehabilitation costs are estimated to be 68 percent of replacement costs. A bridge is considered to need repair if the structure has identified repairs as part of the NBI, a repair cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient. Please note that for a few states, the number of bridges needing to be repaired can vary significantly from year to year, and reflects the data entered by the state.

Bridges are classified by FHWA into types based on the functional classification of the roadway on the bridge. Interstates comprise routes officially designated by the Secretary of Transportation. Other principal arterials serve major centers of urban areas or provide mobility through rural areas. Freeways and expressways have directional lanes generally separated by a physical barrier, and access/egress points generally limited to on- and off-ramps. Minor arterials serve smaller areas and are used for trips of moderate length. Collectors funnel traffic from local roads to the arterial network; major collectors have higher speed limits and traffic volumes and are longer in length and spaced at greater intervals, while minor collectors are shorter and provide service to smaller communities. Local roads do not carry through traffic and are intended for short distance travel.

Compared to 4 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
3. Rhode Island 17.5%
4. South Dakota 17.3%
5. Pennsylvania 13.8%

Compared to 19 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
16. Indiana 1,082
17. South Dakota 1,018
18. Kentucky 990

Compared to 14 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
5. New York 10.5%
6. South Dakota 9.7%
7. Iowa 9.7%
Full State Ranking


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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