National Bridge Inventory: Louisiana



  • Of the 12,899 bridges in the state, 1,678, or 13.0 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 1,609 bridges classified as structurally deficient in 2014.
  • 46 of the structurally deficient bridges are on the Interstate Highway System.
  • 2,083 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 3,347 bridges at an estimated cost of $7.5 billion.
  • This compares to 3,411 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Caddo 1965 86,800 Urban Interstate I20 over St. Louis & SW RR
Calcasieu 1952 81,100 Urban Interstate Calcasieu River Bridge
Jefferson 1967 70,700 Urban Interstate I10 over Vet Mem Hwy
Jefferson 1967 70,700 Urban Interstate I10 over Vet Mem Hwy
Jefferson 1971 61,800 Urban Interstate I10 over Loyola Ave.
Calcasieu 1954 54,500 Rural Interstate I10 over Sabine Relief
Jefferson 1957 52,500 Urban other principal arterial La3046 over R/R,City Sts,La 611
Lafayette 1986 50,300 Urban other principal arterial La3073 over Vermilion River
Bossier 1966 43,950 Urban Interstate I20 over STL&SW-KCS RR/Westerfiel
Bossier 1966 43,950 Urban Interstate I20 over STL&SW-KCS RR/Westerfiel
Orleans 1973 37,553 Urban minor arterial Wisner Blvd over I-610 & Southern RR.
St. Mary 1975 34,600 Urban freeway/expressway US90 over Atchafalaya River
Orleans 1967 33,050 Rural Interstate I10 over Drain Canal
Orleans 1967 33,050 Rural Interstate I10 over Drain Canal
Orleans 1967 33,050 Rural Interstate I10 over Drain Canal
Jefferson 1987 33,000 Urban Interstate US90B over Harvey Canal/Sts/RR
Jefferson 1987 33,000 Urban Interstate US90B over Harvey Canal/Sts/RR
Lafayette 1958 32,900 Urban other principal arterial US0167 over Coulee Mine
Caddo 1965 31,800 Urban Interstate I20 over Lk Shore Dr&Kesrr
Orleans 1973 29,900 Urban other principal arterial La47 over Bayou Bienvenue
Orleans 1969 28,550 Rural local road Unnamed Rd over I-10
Caddo 1965 27,400 Urban Interstate I20 over M.P. RR
Caddo 1965 27,400 Urban Interstate I20 over M.P. RR
East Baton Rouge 1953 26,500 Urban other principal arterial US61 over LA 73 North
St. Bernard 1991 26,200 Urban other principal arterial La39 over LA 39 over RR Canal
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 583 2,961,907 9,372,699 10 83,084 257,710
Rural arterial 629 1,231,196 3,849,534 22 22,457 104,760
Rural minor arterial 1,515 1,201,872 3,618,754 105 140,738 236,263
Rural major collector 1,792 997,823 3,430,652 214 109,993 320,013
Rural minor collector 1,068 381,915 987,104 179 53,863 145,985
Rural local road 3,826 875,158 2,079,933 869 148,972 311,146
Urban Interstate 982 4,674,110 28,874,079 36 428,590 783,570
Urban freeway/expressway 160 812,323 2,580,039 3 81,471 71,800
Urban other principal arterial 577 2,053,544 9,985,852 47 173,596 753,490
Urban minor arterial 492 521,471 4,733,836 62 76,167 521,136
Urban collector 395 285,242 1,829,044 46 15,570 189,820
Urban local road 880 590,587 3,324,269 85 49,699 187,228
Total 12,899 16,587,147 74,665,795 1,678 1,384,201 3,882,921
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 2,950 $7,413 18,613,829 3,839,932
Widening & rehabilitation 0 $0 0 0
Rehabilitation 327 $45 416,082 112,305
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 70 $1 31,479 13,119
Total 3,347 $7,460 19,061,390 3,965,355

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.

7
from 7 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
6. Maine 13.1%
7. Louisiana 13.0%
8. Puerto Rico 11.7%

9
from 8 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
8. New York 1,757
9. Louisiana 1,678
10. Mississippi 1,603
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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