National Bridge Inventory: Louisiana



  • Of the 12,853 bridges in the state, 1,634, or 12.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 1,534 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 8.4 percent of total deck area on all structures.
  • 53 of the structurally deficient bridges are on the Interstate Highway System. A total of 91.4 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.
  • 2,037 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 3,251 bridges at an estimated cost of $6.9 billion.
  • This compares to 3,247 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Calcasieu 1952 86,600 Urban Interstate Calcasieu River Bridge
Caddo 1965 84,672 Urban Interstate I20 over St. Louis & SW RR
Jefferson 1967 65,250 Urban Interstate I10 over Vet Mem Hwy
Jefferson 1967 65,250 Urban Interstate I10 over Vet Mem Hwy
Calcasieu 1954 62,300 Rural Interstate I10 over Sabine Relief
Jefferson 1957 54,200 Urban other principal arterial La3046 over R/R,City Sts,La 611
Jefferson 1987 48,300 Urban Interstate US90B over Harvey Canal/Sts/RR
Jefferson 1987 48,300 Urban Interstate US90B over Harvey Canal/Sts/RR
Bossier 1966 45,300 Urban Interstate I20 over STL&SW-KCS RR/Westerfiel
Bossier 1966 45,300 Urban Interstate I20 over STL&SW-KCS RR/Westerfiel
Bossier 1966 43,950 Urban Interstate I20 over US 71/KCSRR/Ramp Sw
Lincoln 1963 43,700 Urban Interstate I20 over Creek
East Baton Rouge 1960 40,700 Urban other principal arterial US0190 over Creek
Orleans 1967 34,450 Rural Interstate I10 over Drain Canal
Orleans 1967 34,450 Rural Interstate I10 over Drain Canal
Orleans 1967 33,050 Rural Interstate I10 over Drain Canal
Lafayette 1958 32,900 Urban other principal arterial US0167 over Coulee Mine
Orleans 1957 32,700 Urban other principal arterial La39 over Inner Harbor Nav Canal
Jefferson 1971 32,050 Urban Interstate I10 over Loyola Ave.
Caddo 1965 31,800 Urban Interstate I20 over Lk Shore Dr&Kesrr
West Baton Rouge 1969 31,450 Urban Interstate I10 over I-10 over LA 415-Westove
Orleans 1973 31,300 Urban other principal arterial La47 over Bayou Bienvenue
Orleans 1969 28,550 Rural local road Unnamed Rd over I-10 Under City St
Orleans 1969 28,550 Rural local road Unnamed Rd over I-10
Jefferson Davis 1964 27,700 Rural Interstate I10 over US 165 & Mp RR
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 579 2,988,075 9,250,905 13 87,265 296,970
Rural arterial 630 1,232,647 3,856,304 23 28,962 115,750
Rural minor arterial 1,504 1,204,702 3,637,162 111 146,036 242,004
Rural major collector 1,784 997,131 3,410,885 222 115,550 338,092
Rural minor collector 1,067 386,371 1,003,359 178 54,370 142,864
Rural local road 3,756 887,986 2,389,419 796 143,691 331,017
Urban Interstate 999 4,724,953 28,629,050 40 436,941 937,382
Urban freeway/expressway 160 822,212 2,580,549 2 67,961 24,800
Urban other principal arterial 577 2,100,837 9,953,700 47 179,524 759,520
Urban minor arterial 494 517,106 4,786,098 58 74,748 520,219
Urban collector 358 181,372 1,506,554 50 17,461 181,320
Urban local road 945 655,439 4,075,841 94 51,133 164,307
Total 12,853 16,698,831 75,079,826 1,634 1,403,641 4,054,245
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 2,731 $6,677 18,367,257 3,791,072
Widening & rehabilitation 1 $36 22,000 30,552
Rehabilitation 447 $191 622,188 156,274
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 72 $22 32,323 17,969
Total 3,251 $6,926 19,043,768 3,995,867

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.

7
Compared to 7 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
6. Maine 12.7%
7. Louisiana 12.7%
8. Puerto Rico 12.1%

7
Compared to 9 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
6. New York 1,702
7. Louisiana 1,634
8. West Virginia 1,545

11
Compared to 15 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
10. Missouri 9.0%
11. Louisiana 8.0%
12. Pennsylvania 8.0%
Full State Ranking

Advertisement


  • 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.

    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.

  • Privacy & Cookies Policy
Connect With Us

Copyright © 2021 American Road & Transportation Builders Association