National Bridge Inventory: Maine



  • Of the 2,473 bridges in the state, 325, or 13.1 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 346 bridges classified as structurally deficient in 2014.
  • 13 of the structurally deficient bridges are on the Interstate Highway System.
  • 129 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 345 bridges at an estimated cost of $48.9 million.
  • This compares to 903 bridges that needed work in 2014.

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
York 1948 25,580 Rural Interstate I-95(NB) over Mousam River
Cumberland 1989 24,013 Urban other principal arterial Routes 9 & 22 over Stroudwater River
York 1940 20,419 Urban freeway/expressway US Route 1 Bypass over Piscataqua River & Roads
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 N Chan Stillwater River
Penobscot 1952 16,728 Urban minor arterial Stilwater Ave. over S Chan Stillwater River
Penobscot 1962 16,610 Urban Interstate I-95 Southbound over M C RR & Perry Rd
Cumberland 1957 16,596 Rural major collector Routes 125 & 136 over Interstate 295
York 1928 15,672 Rural minor arterial Route US 1 over Kennebunk River
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 13,050 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
Oxford 1929 11,655 Rural minor arterial Main St (Rtes 117 over Tannery (Bird) Brook
Kennebec 1926 10,735 Rural minor arterial Routes 27 & 126 over Togus Stream
York 1938 10,523 Urban minor arterial US1 over Piscataqua River
Penobscot 1960 10,432 Urban collector Sa 6 over Interstate 95
Oxford 1952 10,165 Urban other principal arterial US #2 over Swift River
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 163 122,951 1,595,780 8 6,196 90,940
Rural arterial 137 99,766 1,042,504 12 7,567 71,232
Rural minor arterial 183 96,726 1,016,073 23 8,987 125,377
Rural major collector 463 171,438 1,046,228 59 22,812 123,285
Rural minor collector 266 71,985 322,899 33 7,194 39,090
Rural local road 765 133,477 355,520 136 12,945 32,262
Urban Interstate 141 204,974 2,416,188 5 4,087 102,680
Urban freeway/expressway 23 46,929 212,647 1 9,402 20,419
Urban other principal arterial 53 86,189 748,539 6 3,008 68,549
Urban minor arterial 82 137,744 920,280 10 8,755 116,580
Urban collector 112 68,263 648,751 17 8,596 109,549
Urban local road 85 24,077 115,508 15 5,229 12,964
Total 2,473 1,264,519 10,440,917 325 104,779 912,927
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 4 $2 1,891 943
Widening & rehabilitation 1 $0 799 480
Rehabilitation 339 $46 931,600 107,945
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 1 $0 5 39
Total 345 $49 934,295 109,407

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.

6
from 6 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
5. Pennsylvania 16.6%
6. Maine 13.1%
7. Louisiana 13.0%

36
from 37 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
35. Florida 328
36. Maine 325
37. Idaho 315
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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