National Bridge Inventory: South Dakota

  • Of the 5,897 bridges in the state, 996, or 16.9 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 973 bridges classified as structurally deficient in 2018.
  • The deck area of structurally deficient bridges accounts for 9.2 percent of total deck area on all structures.
  • 4 of the structurally deficient bridges are on the Interstate Highway System. A total of 98.4 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.
  • 1,102 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,353 bridges at an estimated cost of $1.1 billion.
  • This compares to 2,468 bridges that needed work in 2018.

County Year Built Daily Crossings Type of Bridge Location
Brown 1954 19,484 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 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
Moody 1966 7,330 Rural Interstate I029 N over Big Sioux Rv
Moody 1966 7,330 Rural Interstate I029 S over Big Sioux Rv
Minnehaha 1964 6,135 Rural Interstate I090 W over Sd019
Codington 1974 4,970 Urban minor arterial 14th Ave. N, Wtn. over Big Sioux Rv
Codington 1941 4,837 Urban minor arterial 3rd Avenue NW over Big Sioux River
Brule 1952 4,707 Rural minor arterial Sd050 over South Dakota Owned RR
Pennington 1974 4,700 Urban collector Chapel Lane over Rapid Ck
Lyman 1970 4,000 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 2,731 Rural arterial US012 over Ck
Lyman 1953 2,622 Rural local road I090 Wf over South Dakota Owned RR
Grant 1914 2,560 Urban local road 2nd Avenue over Bn Railroad
Pennington 1947 2,199 Rural arterial US385 over Horse Ck
Brown 1974 2,069 Urban collector 10th Avenue SE over Moccasin Creek
Lawrence 1934 2,000 Rural major collector County Rd 014B over Miller 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
Lawrence 1964 1,817 Rural arterial US014A over Ice Box Ck
Minnehaha 1967 1,802 Rural minor collector 487th Ave, Hwy 103 over Beaver 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 333 200,628 1,899,854 4 4,008 24,795
Rural arterial 463 265,540 1,009,184 9 4,589 12,658
Rural minor arterial 540 245,606 679,335 11 14,136 14,222
Rural major collector 1,163 340,050 477,239 147 37,450 53,312
Rural minor collector 228 58,968 39,232 49 8,079 10,860
Rural local road 2,745 393,139 208,313 754 80,676 49,460
Urban Interstate 122 110,888 1,683,321 0 0 0
Urban freeway/expressway 8 10,892 68,250 0 0 0
Urban other principal arterial 77 95,739 811,924 3 13,383 44,207
Urban minor arterial 90 84,933 645,144 3 841 10,157
Urban collector 56 34,122 207,929 7 5,190 37,663
Urban local road 72 19,238 68,789 9 2,281 4,798
Total 5,897 1,859,744 7,798,514 996 170,633 262,132
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,227 $658 677,501 272,805
Widening & rehabilitation 4 $4 47,195 2,744
Rehabilitation 443 $208 189,209 126,333
Deck rehabilitation/replacement 47 $50 124,236 30,648
Other structural work 632 $193 237,367 116,476
Total 2,353 $1,113 1,275,508 549,006

About the data:

Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on February 1, 2023. 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 2021 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 2021

in the nation in % of structurally deficient bridges

1. West Virginia 20.0%
2. Iowa 19.0%
3. South Dakota 17.0%
4. Rhode Island 17.0%

Compared to 17 in 2021

in the nation in # of structurally deficient bridges

1. Iowa 4,604
17. Kentucky 1,013
18. South Dakota 996
19. Wisconsin 922

Compared to 6 in 2021

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 17.0%
7. Iowa 10.0%
8. South Dakota 9.0%
9. Puerto Rico 9.0%
Full State Ranking


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on February 1, 2023. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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