National Bridge Inventory: South Dakota



  • Of the 5,824 bridges in the state, 973, or 16.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 1,068 bridges classified as structurally deficient in 2014.
  • 4 of the structurally deficient bridges are on the Interstate Highway System.
  • 1,120 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,468 bridges at an estimated cost of $534.8 million.
  • This compares to 2,543 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Brown 1954 19,377 Urban other principal arterial US012 over Moccasin Ck
Minnehaha 1979 18,174 Urban collector 49th Street over Big Sioux River
Pennington 1959 10,516 Urban Interstate I090 E over Boxelder Ck
Minnehaha 1912 10,163 Urban collector 8th Street over Big Sioux River
Minnehaha 1948 9,815 Urban minor arterial 60th Street North over Silver Creek
Minnehaha 1960 6,544 Rural Interstate I090 W over Split Rock Ck
Minnehaha 1964 6,485 Rural Interstate I090 W over Sd019
Lawrence 1953 6,425 Rural arterial US014A over Deadwood Ck
Brown 1969 5,087 Urban minor arterial 3rd Avenue SE over Moccasin Creek
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 1967 3,895 Rural minor arterial Sd115 over Ck
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 2,906 Rural arterial US012 over Ck
Clay 1949 2,890 Rural minor arterial Sd046 over Vermillion Rv
Deuel 1971 2,559 Rural arterial US212 over Cain Ck
Brown 1974 2,069 Urban collector 10th Avenue SE over Moccasin Creek
Minnehaha 1966 1,961 Rural major collector 258th St, Hwy 130 over Big Sioux River
Mellette 1957 1,690 Rural arterial US083 over Little White Rv
Pennington 1947 1,685 Rural arterial US385 over Horse Ck
Kingsbury 1952 1,631 Rural minor arterial Sd025 over Ck
Beadle 1951 1,629 Rural minor arterial Sd037 over James Rv
Brown 1930 1,400 Rural major collector 134th Street over Creek
Brookings 1925 1,305 Rural major collector 471St Avenue over 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 333 198,810 1,750,495 3 2,580 13,035
Rural arterial 449 256,654 962,403 10 3,943 20,279
Rural minor arterial 522 226,581 636,730 16 7,757 17,407
Rural major collector 1,149 335,223 444,541 155 40,459 51,768
Rural minor collector 171 46,716 31,153 29 4,878 3,703
Rural local road 2,787 400,409 215,757 738 74,486 43,834
Urban Interstate 121 110,330 1,524,041 1 980 10,516
Urban freeway/expressway 10 15,375 83,282 0 0 0
Urban other principal arterial 75 89,689 835,426 1 812 19,377
Urban minor arterial 86 75,856 602,828 3 970 19,739
Urban collector 56 31,293 203,481 9 5,623 41,906
Urban local road 65 16,834 63,822 8 1,417 2,093
Total 5,824 1,803,770 7,353,959 973 143,905 243,657
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,300 $460 688,885 276,443
Widening & rehabilitation 5 $3 47,042 2,858
Rehabilitation 420 $32 178,790 111,324
Deck rehabilitation/replacement 52 $17 118,961 32,959
Other structural work 691 $23 257,323 126,768
Total 2,468 $535 1,291,001 550,352

About the data:

Data from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), released March 15, 2019. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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 2017 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 cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient.

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.

4
from 5 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
3. Iowa 19.4%
4. South Dakota 16.7%
5. Pennsylvania 16.6%

19
from 19 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
18. Kentucky 1,016
19. South Dakota 973
20. Tennessee 871
Full State Ranking

  • Source: Bridge data is from the 2018 National Bridge Inventory ASCII files, released by the Federal Highway Administration on March 14, 2019. Note that specific conditions on bridges may have changed as a result of recent work. ARTBA is a non-partisan federation whose primary goal is to aggressively grow and protect transportation infrastructure investment to meet the public and business demand for safe and efficient travel.
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