National Bridge Inventory: Tennessee



  • Of the 20,331 bridges in the state, 841, or 4.1 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 889 bridges classified as structurally deficient in 2017.
  • The deck area of structurally deficient bridges accounts for 4.7 percent of total deck area on all structures.
  • 46 of the structurally deficient bridges are on the Interstate Highway System. A total of 84.1 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.
  • 2,017 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 7,448 bridges at an estimated cost of $3.4 billion.
  • This compares to 7,368 bridges that needed work in 2017.

County Year Built Daily Crossings Type of Bridge Location
Davidson 1958 167,340 Urban Interstate I24 over Mill Creek
Knox 1965 162,290 Urban Interstate I40 Rl over I40-Rl / 17th. Street
Davidson 1963 155,540 Urban Interstate I40 over Mill Creek
Hamilton 1960 125,220 Urban Interstate I24 EBL & WBL over Branch
Hamilton 1990 113,980 Urban Interstate I24 WB over I24 WB / A660 & CSX RR
Hamilton 1964 102,100 Urban Interstate I24 WBL over Missionary Ridge
Williamson 1963 100,660 Rural Interstate I65 over Branch
Davidson 1962 97,780 Urban Interstate I40 over I40 / Westboro Road
Shelby 1966 89,400 Urban Interstate I-240SB 348605B over I-240 EB / Agnes Pl & RR
Williamson 1963 81,830 Rural Interstate I65 over I65 / SR106 & Harpeth Rv
Knox 1967 75,410 Urban Interstate I40 over I40 / Asheville Hwy.
Hamilton 1964 75,010 Urban Interstate I24 over Brown S Ferry (FAU 3622)
Shelby 1968 68,590 Urban freeway/expressway Fau 4032 over Waring Rd
Davidson 1972 65,490 Urban Interstate I-24E over Old Hickory Blvd.
Davidson 1972 65,490 Urban Interstate I-24W over Old Hickory Blvd.
Sumner 2006 64,900 Urban freeway/expressway Fap 386 over Sr386-Ll / Sr6 & Ramp F
Cheatham 1960 62,550 Rural Interstate I40 over Harpeth River
Cheatham 1960 62,550 Rural Interstate I40 over Harpeth River
Wilson 1964 61,610 Urban Interstate I40 348852T over CSX Railroad
Wilson 1964 61,610 Urban Interstate I40 over I40 / SR 26
Wilson 1964 61,610 Urban Interstate I40 348852T over CSX Railroad
Wilson 1964 61,610 Urban Interstate I40 over I40 / SR 26
Robertson 1969 59,160 Rural Interstate I65 over I65 Ll / Springfield Rd.
Loudon 1977 54,060 Rural Interstate I75 over Tennessee River
Davidson 1969 52,110 Urban freeway/expressway Fau 6 over SR 6 Ll / Douglas Avenue
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 835 955,518 30,765,421 25 42,370 1,113,020
Rural arterial 1,120 1,048,241 11,376,975 23 41,100 177,380
Rural minor arterial 1,597 1,003,913 8,128,779 48 37,564 269,510
Rural major collector 1,944 736,477 3,752,020 68 31,887 121,810
Rural minor collector 3,230 817,139 2,715,298 148 37,407 103,400
Rural local road 6,932 1,105,545 2,027,751 326 46,969 79,907
Urban Interstate 800 1,446,999 61,486,722 21 31,256 1,675,530
Urban freeway/expressway 272 474,376 11,074,364 8 16,205 387,280
Urban other principal arterial 1,092 1,394,150 23,299,400 57 117,927 1,327,210
Urban minor arterial 916 845,008 12,151,268 47 54,141 605,910
Urban collector 584 259,406 2,913,545 26 10,641 121,300
Urban local road 1,009 308,917 2,049,490 44 16,760 111,010
Total 20,331 10,395,689 171,741,033 841 484,227 6,093,267
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 920 $439 3,830,716 339,632
Widening & rehabilitation 3,492 $1,219 19,915,196 1,384,086
Rehabilitation 2,570 $1,450 42,002,732 1,600,487
Deck rehabilitation/replacement 126 $189 1,215,720 207,497
Other structural work 340 $150 1,814,645 171,322
Total 7,448 $3,447 68,779,009 3,703,024

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. 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 January 3, 2022.

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 2020 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.

41
Compared to 42 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
40. Minnesota 4.6%
41. Tennessee 4.1%
42. Virginia 3.8%

20
Compared to 20 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
19. Wisconsin 987
20. Tennessee 841
21. Texas 789

29
Compared to 39 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
28. Kentucky 4.8%
29. Tennessee 4.7%
30. New Mexico 4.7%
Full State Ranking

Advertisement


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. 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 © 2022 American Road & Transportation Builders Association