National Bridge Inventory: Tennessee



  • Of the 20,235 bridges in the state, 881, or 4.4 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 924 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 4.7 percent of total deck area on all structures.
  • 40 of the structurally deficient bridges are on the Interstate Highway System. A total of 85.7 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.
  • 1,726 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 7,428 bridges at an estimated cost of $3.7 billion.
  • This compares to 7,348 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Davidson 1958 178,050 Urban Interstate I24 over Mill Creek
Knox 1965 157,490 Urban Interstate I40 Rl over I40-Rl / 17th. Street
Hamilton 1960 129,060 Urban Interstate I24 EBL & WBL over Branch
Hamilton 1990 119,090 Urban Interstate I24 WB over I24 WB / A660 & CSX RR
Davidson 1962 103,010 Urban Interstate I40 over I40 / Westboro Road
Williamson 1963 91,590 Rural Interstate I65 over Branch
Hamilton 1964 83,120 Urban Interstate I24 over Brown S Ferry (FAU 3622)
Davidson 1972 69,790 Urban Interstate I24 over I24 Rl / Old Hickory Blv
Davidson 1972 69,790 Urban Interstate I24 over I24 Ll / Old Hickory Blv
Shelby 1968 68,590 Urban freeway/expressway Fau 4032 over Waring Rd
Hamilton 1958 67,400 Urban Interstate I124 SBL over W. 9th St. (FAU 3551)
Sumner 2006 60,030 Urban freeway/expressway Fap 386 over Sr386-Ll / Sr6 & Ramp F
Sumner 1969 56,540 Rural Interstate I65 over I65 / Cartwright Circle
Robertson 1969 56,460 Rural Interstate I65 over I65 Ll / Springfield Rd.
Cheatham 1960 54,850 Rural Interstate I40 over Harpeth River
Cheatham 1960 54,850 Rural Interstate I40 over Harpeth River
Wilson 1964 52,890 Urban Interstate I40 348852T over CSX Railroad
Wilson 1964 52,890 Urban Interstate I40 348852T over CSX Railroad
Wilson 1964 52,890 Urban Interstate I40 over I40 / SR 26
Wilson 1964 52,890 Urban Interstate I40 over I40 / SR 26
Madison 1961 50,760 Urban Interstate I40 over SR 5
Roane 1960 49,650 Rural Interstate I40 Rt Ln over Clinch River & Nfa A774
Loudon 1977 49,530 Rural Interstate I75 over Tennessee River
Davidson 1969 48,080 Urban freeway/expressway Fau 6 over SR 6 Ll / Douglas Avenue
Davidson 1969 48,080 Urban freeway/expressway Fau 6 over SR 6 Rl / 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 830 949,070 29,743,061 22 41,350 917,910
Rural arterial 1,115 1,046,946 11,173,395 21 40,942 173,480
Rural minor arterial 1,599 996,358 7,930,583 51 35,583 291,280
Rural major collector 1,942 735,795 3,712,308 70 35,567 115,720
Rural minor collector 3,212 814,405 2,686,582 156 38,019 105,380
Rural local road 6,901 1,097,052 2,034,721 357 49,530 87,657
Urban Interstate 791 1,434,686 60,251,960 18 17,968 1,357,040
Urban freeway/expressway 272 474,376 10,524,340 8 16,205 372,830
Urban other principal arterial 1,091 1,393,945 22,571,330 57 103,682 1,346,260
Urban minor arterial 910 842,493 11,884,948 53 68,660 624,270
Urban collector 580 258,826 2,886,955 25 10,283 125,990
Urban local road 992 303,870 2,013,500 43 15,014 104,200
Total 20,235 10,347,821 167,413,683 881 472,803 5,622,017
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 952 $475 3,959,348 345,654
Widening & rehabilitation 3,487 $1,297 19,859,676 1,385,334
Rehabilitation 2,546 $1,542 40,737,900 1,569,043
Deck rehabilitation/replacement 117 $202 901,010 203,281
Other structural work 326 $155 1,701,113 166,699
Total 7,428 $3,671 67,159,047 3,670,011

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.

41
Compared to 42 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
40. Oregon 4.8%
41. Tennessee 4.4%
42. Virginia 4.1%

20
Compared to 20 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
19. Wisconsin 979
20. Tennessee 881
21. Texas 818

31
Compared to 39 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
30. Arkansas 5.0%
31. Tennessee 5.0%
32. New Mexico 4.0%
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