National Bridge Inventory: Connecticut



  • Of the 4,270 bridges in the state, 308, or 7.2 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 376 bridges classified as structurally deficient in 2014.
  • 46 of the structurally deficient bridges are on the Interstate Highway System.
  • 162 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 421 bridges at an estimated cost of $1.6 billion.
  • This compares to 382 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Fairfield 1957 145,000 Urban Interstate Yankee Doodle Bridge
New Haven 1956 136,400 Urban Interstate Interstate-95 over Metro North
New Haven 1964 133,900 Urban Interstate Interstate 91 over N Front St & Quinn River
New Haven 1965 133,900 Urban Interstate Interstate-91 over Amtrak Railroad
Fairfield 1958 131,600 Urban Interstate Interstate-95 over Byram River,S Water St
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
Hartford 1961 125,700 Urban Interstate Interstate-84 over Market Street & I-91 NB
New Haven 1960 108,800 Urban Interstate Interstate-84 over Mad River
Hartford 1964 88,900 Urban Interstate Interstate-84 WB over Amtrak RR & Local Roads
New Haven 1958 85,300 Urban Interstate Interstate-95 over US Route 1
Hartford 1966 76,450 Urban Interstate Interstate-84 EB over Amtrak RR & Local Roads
Hartford 1966 71,450 Urban Interstate Interstate-84 EB over Broad St, I-84 Ramp 191
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 67,500 Urban Interstate Interstate-95 over Route 161
Hartford 1965 66,450 Urban Interstate Interstate-84 EB over Amtrak;Local Rds;Parking
Hartford 1965 66,150 Urban Interstate Interstate-84 WB over Amtrak;Local Rds;Parking
New Haven 1967 65,750 Urban Interstate Interstate-84 WB over Rte 8, Naugatuck River
New Haven 1967 65,750 Urban Interstate Interstate-84 EB over I-84WB,Rte8,Naugatuck Rv
Fairfield 1951 64,640 Urban freeway/expressway Route 8 over Housatonic River, Rt 110
Hartford 1958 64,100 Urban Interstate I-291 & King St. over Podunk River
New London 1943 58,300 Urban Interstate Interstate 95 Nort over Thames Rv,RR,Local Roads
Hartford 1987 51,950 Urban Interstate Interstate-84 EB over Route 15
Middlesex 1950 51,200 Urban freeway/expressway Route 9 over P&W Railroad & Union St
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 79 120,288 2,075,679 1 5,166 36,650
Rural arterial 124 68,723 1,607,644 0 0 0
Rural minor arterial 98 35,911 582,253 6 2,624 36,117
Rural major collector 244 68,307 848,080 12 3,145 37,801
Rural minor collector 82 19,633 109,974 4 1,249 3,332
Rural local road 497 84,992 287,547 53 7,966 34,578
Urban Interstate 740 1,368,210 44,572,953 45 242,856 2,558,500
Urban freeway/expressway 563 638,926 16,282,660 19 49,883 453,844
Urban other principal arterial 332 278,498 5,038,456 22 42,624 364,326
Urban minor arterial 501 332,589 5,179,651 42 25,693 399,053
Urban collector 439 215,588 2,260,278 41 13,317 196,570
Urban local road 571 183,167 1,090,277 63 13,172 150,691
Total 4,270 3,414,833 79,935,452 308 407,696 4,271,462
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 105 $328 1,282,841 79,074
Widening & rehabilitation 3 $3 64,203 1,812
Rehabilitation 270 $1,070 4,717,335 469,156
Deck rehabilitation/replacement 5 $4 36,783 2,931
Other structural work 38 $173 825,039 74,581
Total 421 $1,578 6,926,201 627,554

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.

26
from 26 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
25. Wisconsin 7.4%
26. Connecticut 7.2%
27. Kentucky 7.1%

38
from 36 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
37. Idaho 315
38. Connecticut 308
39. Maryland 274
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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