National Bridge Inventory: South Dakota



  • The state has identified needed repairs on 2,305 bridges.
  • This compares to 2,443 bridges that needed work in 2019.
  • Over the life of the IIJA, South Dakota will receive a total of $225.0 million in bridge formula funds, which will help make needed repairs.
  • South Dakota currently has access to $90.0 million of that total, and has committed $12.4 million towards 1 project as of June 2023.
  • Of the 5,889 bridges in the state, 985, 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 991 bridges classified as structurally deficient in 2019.
  • The deck area of structurally deficient bridges accounts for 9.6 percent of total deck area on all structures.

County Year Built Daily Crossings Type of Bridge Location
Brown 1954 20,595 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 1986 9,363 Urban collector S. Cliff Avenue over Big Sioux River
Minnehaha 1999 9,273 Urban other principal arterial Benson Road over Big Sioux Diversion
Minnehaha 1989 8,325 Rural Interstate I090 E over Sd038
Minnehaha 1975 7,850 Urban collector 6th Street over Big Sioux River
Moody 1966 7,560 Rural Interstate I029 S over Big Sioux Rv
Moody 1966 7,560 Rural Interstate I029 N over Big Sioux Rv
Hughes 1950 7,155 Urban minor arterial Capitol Ave over Capitol Lake Outlet
Codington 1974 4,970 Urban minor arterial 14th Ave. N, Wtn. over Big Sioux Rv
Pennington 1974 4,700 Urban collector Chapel Lane over Rapid Ck
Brule 1952 4,354 Rural minor arterial Sd050 over R&W RR
Lyman 1970 3,905 Rural Interstate I090 E over 3 Ave
Minnehaha 1953 3,859 Rural minor arterial Sd011 over West Pipestone Ck
Beadle 1960 3,774 Urban other principal arterial US014 over James Rv
Edmunds 1974 2,701 Rural arterial US012 over Ck
Pennington 1973 2,677 Rural major collector Neck Yoke Road over Spring Ck
Lyman 1953 2,622 Rural local road I090 Wf over R&W RR
Grant 1914 2,560 Urban local road 2nd Avenue over Bn Railroad
Pennington 1947 2,364 Rural arterial US385 over Horse Ck
Brown 1974 2,069 Urban collector 10th Avenue SE over Moccasin Creek
Pennington 1972 2,013 Rural major collector Nemo Road over Box Elder Ck
Lawrence 1934 2,000 Rural major collector County Rd 014B over Miller Ck
Todd 1972 1,851 Rural major collector IRR BIA Rte 7 over Little White River
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 333 201,862 1,942,043 4 4,119 27,350
Rural arterial 462 265,848 1,001,487 11 16,403 13,088
Rural minor arterial 541 246,037 677,412 14 15,400 18,755
Rural major collector 1,162 339,202 493,914 139 33,885 51,871
Rural minor collector 227 58,958 39,819 52 8,521 10,829
Rural local road 2,738 392,656 216,709 741 77,007 50,243
Urban Interstate 122 111,135 1,725,829 0 0 0
Urban freeway/expressway 8 10,892 68,202 0 0 0
Urban other principal arterial 77 95,739 819,757 4 15,333 49,092
Urban minor arterial 91 85,895 665,702 3 848 12,475
Urban collector 56 34,834 207,929 6 5,487 42,796
Urban local road 72 19,240 68,789 11 2,502 5,023
Total 5,889 1,862,300 7,927,592 985 179,504 281,522
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,180 $742 636,756 262,364
Widening & rehabilitation 2 $3 22,990 1,357
Rehabilitation 451 $248 199,588 130,075
Deck rehabilitation/replacement 48 $65 134,515 32,955
Other structural work 624 $218 237,226 115,031
Total 2,305 $1,276 1,231,075 541,781

About the data:

Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on July 3, 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 2022 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.

3
Compared to 3 in 2022

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 15.0%

18
Compared to 18 in 2022

in the nation in # of structurally deficient bridges

1. Iowa 4,558
17. Kentucky 1,012
18. South Dakota 985
19. Wisconsin 943

9
Compared to 8 in 2022

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 15.0%
8. Puerto Rico 10.0%
9. South Dakota 10.0%
10. Michigan 8.0%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on July 3, 2023. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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