National Bridge Inventory: Maine



  • Of the 2,485 bridges in the state, 314, or 12.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 323 bridges classified as structurally deficient in 2017.
  • The deck area of structurally deficient bridges accounts for 8.9 percent of total deck area on all structures.
  • 24 of the structurally deficient bridges are on the Interstate Highway System. A total of 85.4 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.
  • 126 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 $262.6 million.
  • This compares to 341 bridges that needed work in 2017.

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
Androscoggin 1975 19,242 Urban other principal arterial Main St over pedestrian walkway
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
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 I 95 NB 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
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
Oxford 1929 11,655 Rural minor arterial Main St (Rtes 117 over Tannery (Bird) Brook
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 163 123,968 1,595,780 16 15,431 150,770
Rural arterial 144 100,904 1,062,185 13 8,387 90,645
Rural minor arterial 185 99,691 1,042,646 23 8,245 115,312
Rural major collector 468 173,203 1,056,535 61 18,942 128,740
Rural minor collector 266 72,919 325,998 27 7,925 28,134
Rural local road 761 133,826 358,164 116 11,398 34,196
Urban Interstate 141 204,046 2,416,188 8 8,658 161,617
Urban freeway/expressway 24 47,473 239,469 1 559 7,825
Urban other principal arterial 52 86,346 739,991 8 3,854 96,203
Urban minor arterial 83 139,404 929,770 13 17,728 146,148
Urban collector 115 68,373 661,294 14 6,658 80,512
Urban local road 83 23,971 115,559 14 5,434 14,951
Total 2,485 1,274,126 10,543,579 314 113,218 1,055,053
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 5 $3 1,911 1,020
Widening & rehabilitation 1 $1 799 480
Rehabilitation 325 $258 1,072,047 116,042
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 2 $1 255 253
Total 333 $263 1,075,012 117,795

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.

7
Compared to 6 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
6. Louisiana 12.8%
7. Maine 12.6%
8. Puerto Rico 12.1%

36
Compared to 36 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
35. Georgia 319
36. Maine 314
37. Puerto Rico 282

8
Compared to 17 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
7. Iowa 9.7%
8. Maine 8.9%
9. Puerto Rico 8.9%
Full State Ranking

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  • 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.

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