National Bridge Inventory: Connecticut



  • Of the 4,357 bridges in the state, 248, or 5.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 336 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 7.6 percent of total deck area on all structures.
  • 25 of the structurally deficient bridges are on the Interstate Highway System. A total of 78.2 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.
  • 166 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 438 bridges at an estimated cost of $2.0 billion.
  • This compares to 365 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
New Haven 1956 136,400 Urban Interstate Interstate-95 over Metro North
New Haven 1965 133,900 Urban Interstate Interstate-91 over Amtrak Railroad
Fairfield 1957 129,900 Urban Interstate Interstate-95 over Route 33
Fairfield 1958 127,300 Urban Interstate I-95 & I-95 Ramps over MNRR & Local Roads
Fairfield 1958 84,300 Urban Interstate Interstate-95 over US Route 1
Fairfield 1938 69,900 Urban freeway/expressway Route 15 over Saugatuck River
Hartford 1967 69,000 Urban Interstate Interstate-84 East over New Park Av,Amtrak,Sr504
New London 1958 67,000 Urban Interstate Interstate-95 over Route 161
New Haven 1967 65,750 Urban Interstate Interstate-84 EB over I-84WB,Rte8,Naugatuck Rv
Hartford 1958 64,100 Urban Interstate I-291 & King St. over Podunk River
Middlesex 1950 56,000 Urban freeway/expressway Route 9 over P&W Railroad & Union St
New London 1943 52,050 Urban Interstate Interstate 95 Nort over Thames Rv,RR,Local Roads
Hartford 1987 51,950 Urban Interstate Interstate-84 EB over Route 15
Hartford 1964 48,200 Urban Interstate Interstate-91 SB over Csorr, SR 598WB & Tr803
Fairfield 1953 39,795 Urban Interstate Interstate 84 East over Housatonic River
Fairfield 1979 36,650 Urban Interstate Interstate-84 WB over Pole Bridge Brook
New Haven 1967 35,400 Urban Interstate Interstate 84 WB over Rte 8, Naug Riv, M-N RR
New Haven 1855 34,600 Urban other principal arterial Route 34 over Wepawaug River
Middlesex 1938 34,400 Urban other principal arterial Route 66 over P&W RR Rt9 Conn River
Fairfield 1968 33,500 Urban Interstate Interstate 684 NB over Byram River
Litchfield 1953 30,700 Urban other principal arterial US 202 & Rt. 67 over Housatonic River
Fairfield 1958 30,400 Urban Interstate Interstate-395 over Moosup River & Route 14
New Haven 1966 30,150 Urban freeway/expressway Route 8 Southbound over Riverside St-Sunnyside
New Haven 1946 28,650 Urban freeway/expressway Route 15 NB over Quinnipiac River
New Haven 1966 27,200 Urban freeway/expressway Route 8 Northbound over Metro-North 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 78 115,485 2,080,932 0 0 0
Rural arterial 124 68,867 1,651,236 0 0 0
Rural minor arterial 96 35,090 576,148 4 2,415 24,317
Rural major collector 246 68,809 856,242 8 1,320 29,133
Rural minor collector 82 18,488 108,478 5 1,203 3,939
Rural local road 506 84,926 285,681 44 4,749 16,216
Urban Interstate 748 1,387,682 44,819,322 25 137,949 1,282,317
Urban freeway/expressway 564 641,011 16,594,840 15 26,068 382,404
Urban other principal arterial 339 283,596 5,133,333 14 38,215 267,808
Urban minor arterial 500 335,799 5,158,837 32 22,364 328,825
Urban collector 453 218,495 2,321,097 35 11,022 166,116
Urban local road 621 188,996 1,151,824 66 12,638 138,621
Total 4,357 3,447,244 80,737,970 248 257,944 2,639,696
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 147 $394 1,454,559 87,209
Widening & rehabilitation 4 $41 200,840 13,902
Rehabilitation 241 $1,337 4,040,320 447,909
Deck rehabilitation/replacement 5 $8 30,928 2,422
Other structural work 41 $208 772,094 69,229
Total 438 $1,989 6,498,741 620,672

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.

31
Compared to 26 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
30. Indiana 5.7%
31. Connecticut 5.7%
32. Colorado 5.4%

40
Compared to 38 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
39. Maryland 273
40. Connecticut 248
41. Wyoming 218

16
Compared to 3 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
15. Michigan 8.0%
16. Connecticut 8.0%
17. Montana 7.0%
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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