National Bridge Inventory: South Dakota

  • Of the 5,880 bridges in the state, 1,038, or 17.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 1,055 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 9.9 percent of total deck area on all structures.
  • 2 of the structurally deficient bridges are on the Interstate Highway System. A total of 98.7 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.
  • 1,153 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,477 bridges at an estimated cost of $992.9 million.
  • This compares to 2,614 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Brown 1954 18,971 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
Pennington 1959 11,610 Urban Interstate I090 E over Boxelder Ck
Minnehaha 1912 10,163 Urban collector 8th Street over Big Sioux River
Minnehaha 1975 7,850 Urban collector 6th Street over Big Sioux River
Minnehaha 1964 6,995 Rural Interstate I090 W over Sd019
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
Minnehaha 1978 3,377 Rural major collector 478th Ave, Hwy 121 over Big Sioux River
Clay 1949 3,303 Rural minor arterial Sd046 over Vermillion Rv
Minnehaha 1961 3,300 Urban collector E 60th St N over I229
Edmunds 1974 2,912 Rural arterial US012 over Ck
Grant 1914 2,560 Urban local road 2nd Avenue over Bn Railroad
Pennington 1947 2,080 Rural arterial US385 over Horse Ck
Brown 1974 2,069 Urban collector 10th Avenue SE over Moccasin Creek
Lawrence 1971 2,000 Rural major collector Exit 10 Service Rd over Spearfish Ck
Minnehaha 1966 1,961 Rural major collector 258th St, Hwy 130 over Big Sioux River
Lake 1937 1,900 Rural major collector 235 St over Silver Ck
Kingsbury 1952 1,698 Rural minor arterial Sd025 over Ck
Pennington 1972 1,650 Rural major collector Resevoir Road over Rapid Ck
Beadle 1951 1,647 Rural minor arterial Sd037 over James Rv
Codington 1940 1,499 Rural local road Sioux Conifer Road over Big Sioux Rv
Mellette 1957 1,475 Rural arterial US083 over Little White Rv
Brown 1930 1,400 Rural major collector 134th Street over Creek
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 333 199,879 1,807,504 1 611 6,995
Rural arterial 455 258,400 970,291 10 3,955 13,508
Rural minor arterial 524 238,256 671,106 15 16,605 14,051
Rural major collector 1,157 336,498 454,527 170 46,259 62,452
Rural minor collector 216 61,693 34,204 37 5,743 4,200
Rural local road 2,777 397,174 215,662 783 82,743 47,128
Urban Interstate 121 110,330 1,615,710 1 980 11,610
Urban freeway/expressway 10 15,375 83,515 0 0 0
Urban other principal arterial 75 87,347 815,078 2 11,077 34,421
Urban minor arterial 88 78,985 627,825 1 426 4,837
Urban collector 56 33,826 203,481 9 6,792 48,667
Urban local road 68 18,105 66,583 9 2,202 4,773
Total 5,880 1,835,867 7,565,486 1,038 177,392 252,642
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,327 $603 686,317 285,428
Widening & rehabilitation 5 $5 46,666 2,857
Rehabilitation 445 $174 176,167 125,419
Deck rehabilitation/replacement 51 $50 121,647 32,694
Other structural work 649 $161 246,808 118,481
Total 2,477 $993 1,277,605 564,878

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on March 11, 2021. 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 March 11, 2021.

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 2019 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 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
3. Rhode Island 19.0%
4. South Dakota 17.7%
5. Pennsylvania 14.6%

Compared to 19 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
16. Indiana 1,111
17. South Dakota 1,038
18. Kentucky 1,033

Compared to 14 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
5. Iowa 10.0%
6. South Dakota 10.0%
7. New York 10.0%
Full State Ranking


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on March 11, 2021. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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