National Bridge Inventory: South Carolina



  • Of the 9,455 bridges in the state, 745, or 7.9 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 826 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 6.0 percent of total deck area on all structures.
  • 19 of the structurally deficient bridges are on the Interstate Highway System. A total of 89.4 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.
  • 663 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,617 bridges at an estimated cost of $1.2 billion.
  • This compares to 1,631 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Greenville 1960 119,700 Urban Interstate I-85 over Trib Laurel Crk
Charleston 1963 99,000 Urban Interstate I-26 EB over S.C.L. RR & Southern Rwy
Richland 1977 56,800 Urban freeway/expressway SC 277 NB over I-77
Spartanburg 1953 52,000 Urban freeway/expressway SC 85 over S-2
Spartanburg 1953 49,800 Urban freeway/expressway SC 85 over Southern RR & S-42-995
Greenville 1939 40,200 Urban other principal arterial US 29 over Mountain Creek
Greenville 1939 40,200 Urban other principal arterial US 29 over Enoree River
Greenville 1981 40,100 Urban minor arterial SC 146 over I-385
Horry 1958 39,700 Urban other principal arterial US 501 Byp over Waccamaw River
Greenville 1960 33,800 Urban other principal arterial US 29 over S-75
Berkeley 1944 32,600 Rural arterial US 17 Alt over Santee Tail Race Canal
Jasper 1968 31,350 Rural Interstate I-95 SB over S.C. 46
York 1971 29,800 Rural minor arterial SC 49 over Crowders Creek
Lexington 1965 29,000 Urban other principal arterial US 1 over I-20
Greenville 1968 28,900 Urban other principal arterial US 123 over L-3199/Reedy River
Beaufort 1956 28,550 Urban other principal arterial US 278 EBL over Mackay Creek
Jasper 1968 28,150 Rural Interstate I-95 SB over Bagshaw Swamp
Greenville 1980 24,400 Urban minor arterial S-23-107 over I-385
Greenville 1957 24,400 Urban Interstate I-185 over U.S. 25 By Pass
Horry 1956 23,500 Urban minor arterial US 701 over Crabtree Swamp
Spartanburg 1958 23,100 Urban minor arterial SC 9 over SC 85
Charleston 1972 22,800 Urban minor arterial S-10-97 over Tidal Stream
Cherokee 1954 22,450 Rural Interstate I-85 SB over Southern Railroad
Newberry 1960 21,800 Rural Interstate I-26 WB over Indian Creek
Spartanburg 1949 21,000 Urban minor arterial US 221 over Clinchfield Railroad
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 353 466,746 8,618,285 13 21,204 266,400
Rural arterial 495 787,336 3,469,329 36 70,450 242,250
Rural minor arterial 752 786,598 3,303,057 90 83,649 360,100
Rural major collector 2,137 844,867 2,829,335 179 63,536 227,990
Rural minor collector 442 115,381 162,425 24 4,850 8,550
Rural local road 2,617 576,787 744,783 226 39,948 54,564
Urban Interstate 393 1,142,928 14,773,970 6 11,301 289,100
Urban freeway/expressway 108 290,365 2,143,689 6 7,682 206,850
Urban other principal arterial 381 885,518 7,902,147 18 45,324 369,500
Urban minor arterial 546 675,808 6,494,620 47 40,046 492,150
Urban collector 597 285,463 2,758,025 52 24,243 248,550
Urban local road 634 178,488 678,638 48 9,887 33,800
Total 9,455 7,036,285 53,878,303 745 422,122 2,799,804
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 678 $379 1,963,884 265,964
Widening & rehabilitation 687 $544 6,282,383 538,895
Rehabilitation 235 $163 1,180,720 164,950
Deck rehabilitation/replacement 2 $21 16,060 20,511
Other structural work 15 $61 151,535 59,810
Total 1,617 $1,168 9,594,582 1,050,130

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.

20
Compared to 21 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
19. Mississippi 8.2%
20. South Carolina 7.9%
21. North Carolina 7.8%

22
Compared to 21 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
21. Texas 818
22. South Carolina 745
23. Arkansas 663

24
Compared to 25 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
23. California 7.0%
24. South Carolina 6.0%
25. Colorado 5.0%
Full State Ranking

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  • 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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