National Bridge Inventory: Maine



  • Of the 2,472 bridges in the state, 315, or 12.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 339 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 7.8 percent of total deck area on all structures.
  • 15 of the structurally deficient bridges are on the Interstate Highway System. A total of 88.9 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.
  • 115 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 333 bridges at an estimated cost of $314.0 million.
  • This compares to 786 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Cumberland 1959 27,320 Urban Interstate I-295 Northbound over Route 88
Cumberland 1959 27,080 Urban Interstate I 295 Southbound over Route 88
Cumberland 1961 27,010 Urban Interstate I 295 over Veranda St & US 1
Penobscot 1960 25,340 Urban Interstate I-95 over Route 15
Cumberland 1959 24,130 Urban Interstate I 295 Northbound over Route US 1
Cumberland 1989 24,013 Urban other principal arterial Routes 9 & 22 over Stroudwater River
Cumberland 1959 23,700 Urban Interstate I 295 Southbound over Route US 1
Sagadahoc 1933 18,940 Rural arterial US Route 1 over M C RR & A Marsh
Cumberland 1931 16,790 Urban minor arterial US 201 over Androscoggin River
Penobscot 1952 16,728 Urban minor arterial Stilwater Ave. over S Chan Stillwater River
Penobscot 1952 16,728 Urban minor arterial Stilwater Ave. over N Chan Stillwater River
Cumberland 1957 16,596 Rural major collector Routes 125 & 136 over Interstate 295
Kennebec 1959 15,250 Rural Interstate I-95 Southbound over Webb Road
Kennebec 1959 15,150 Rural Interstate Interstate 95 NB over Webb Road
Kennebec 1918 14,964 Urban minor arterial Routes US 201 & 9 over Cobbossee Stream & Stree
York 1958 14,260 Urban minor arterial Route 4 over Mousam River
Penobscot 1961 13,100 Rural Interstate I 95 SB over Souadabscook Stream
Penobscot 1961 13,100 Rural Interstate I-95 SB over Souadabscook Stream
Penobscot 1961 13,050 Rural Interstate 95 NB over Souadabscook Stream
Penobscot 1961 13,050 Rural Interstate 95 NB over Souadabscook Str
Penobscot 1961 13,050 Rural Interstate I 95 NB over Souadabscook Stream
Cumberland 1936 12,879 Urban collector Route US 1 over M C RR
Waldo 1934 12,663 Urban other principal arterial US 1 & 3 over Goose River
Cumberland 1960 12,430 Urban minor arterial Bucknam Rd over I295
Kennebec 1972 11,840 Rural Interstate I-295 SB Underpass over I-95
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 163 122,340 1,595,780 9 6,008 116,560
Rural arterial 139 100,162 1,050,275 14 8,488 95,147
Rural minor arterial 185 99,482 1,042,646 24 7,679 123,461
Rural major collector 464 172,360 1,052,750 63 21,986 139,278
Rural minor collector 267 72,716 326,418 27 6,114 28,371
Rural local road 760 133,265 358,766 124 12,391 35,824
Urban Interstate 141 204,022 2,416,188 6 5,565 154,580
Urban freeway/expressway 23 47,120 206,268 0 0 0
Urban other principal arterial 52 86,321 739,991 6 3,009 68,549
Urban minor arterial 82 138,543 920,280 14 12,935 157,957
Urban collector 114 68,211 660,504 15 8,180 96,483
Urban local road 82 23,503 115,152 13 5,339 14,873
Total 2,472 1,268,045 10,485,018 315 97,694 1,031,083
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 5 $4 1,911 1,020
Widening & rehabilitation 1 $1 799 480
Rehabilitation 326 $308 1,048,077 100,517
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 1 $0 5 40
Total 333 $314 1,050,792 102,057

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.

6
Compared to 6 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
5. Pennsylvania 14.6%
6. Maine 12.7%
7. Louisiana 12.7%

36
Compared to 36 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
35. Georgia 374
36. Maine 315
37. Idaho 286

14
Compared to 17 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
13. Wyoming 8.0%
14. Maine 8.0%
15. Michigan 8.0%
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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