National Bridge Inventory: Maryland



  • Of the 5,446 bridges in the state, 253, or 4.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 288 bridges classified as structurally deficient in 2017.
  • The deck area of structurally deficient bridges accounts for 3.1 percent of total deck area on all structures.
  • 8 of the structurally deficient bridges are on the Interstate Highway System. A total of 87.0 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.
  • 445 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,606 bridges at an estimated cost of $5.3 billion.
  • This compares to 1,673 bridges that needed work in 2017.

County Year Built Daily Crossings Type of Bridge Location
Baltimore 1958 188,860 Urban Interstate IS 695 over US 40
Baltimore 1958 82,953 Urban Interstate IS 895 over City Streets,B&O,Pa RR
Baltimore 1965 72,000 Urban Interstate Perring Pkwy Ramp over Herring Run
Baltimore 1951 70,700 Urban other principal arterial Russell Street Via over Ostend Street and CSX
Washington 1968 62,740 Urban Interstate IS 70 EB over MD 65
Washington 1965 62,680 Urban Interstate IS 70 WB over US 11
Washington 1965 62,680 Urban Interstate IS 70 EB over US 11
Baltimore 1921 58,858 Urban other principal arterial Pulaski Highway over Herring Run
Prince George's 1959 46,652 Urban freeway/expressway MD 4 WBr over MD 717
Baltimore 1963 46,276 Urban other principal arterial Russell Street over CSX
Baltimore 1961 44,115 Urban other principal arterial Patapsco Avenue WB over Patapsco River
Baltimore 1936 35,470 Urban other principal arterial Wilkens Avenue over Gwynns Falls
Baltimore 1961 34,803 Urban other principal arterial Rolling Road over Branch of Dead Run
Baltimore 1963 32,043 Urban collector Brehms Lane over Herring Run
Frederick 1957 30,410 Urban freeway/expressway US 15 NBR over MD 77, Hunting Creek
Baltimore 1962 29,900 Urban Interstate I-83 over Mta Light Rail
Baltimore 1938 28,810 Urban local road Howard Street over I-83, CSX, Mta, Amtrak,
Baltimore 1930 24,652 Urban other principal arterial US 1 over CSX Transportation
Baltimore 1968 24,180 Urban other principal arterial Broening Highway over Colgate Creek
Baltimore 1961 23,835 Urban local road Patapsco Avenue EB over Patapsco River
Baltimore 1929 23,800 Urban other principal arterial Hanover Street over CSX
Baltimore 1961 22,500 Urban local road Old Court Road over Gwynns Falls, Mta Metro
Prince George's 1966 22,300 Urban local road Cherry Hill Road over Little Paint Branch
Washington 1967 21,909 Urban minor arterial Halfway Boulevard over Norfolk Southern Railroa
Baltimore 1911 21,704 Urban other principal arterial Harford Road over Herring Run
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 187 236,156 8,878,136 0 0 0
Rural arterial 180 317,616 3,834,641 1 729 10,370
Rural minor arterial 224 134,928 1,757,640 8 977 14,492
Rural major collector 355 164,972 1,522,143 12 2,859 46,244
Rural minor collector 491 122,005 982,945 28 4,251 60,508
Rural local road 1,041 194,563 1,034,156 99 12,480 55,919
Urban Interstate 696 1,848,625 53,772,225 8 40,066 577,223
Urban freeway/expressway 432 850,737 19,170,349 5 3,845 120,323
Urban other principal arterial 423 683,608 11,633,380 19 48,731 495,453
Urban minor arterial 374 343,968 5,222,784 4 4,113 49,595
Urban collector 312 164,566 2,364,277 12 3,905 134,288
Urban local road 731 416,441 5,838,190 57 46,627 511,513
Total 5,446 5,478,186 116,010,866 253 168,583 2,075,928
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 304 $1,135 7,598,786 322,474
Widening & rehabilitation 190 $517 2,720,159 202,642
Rehabilitation 610 $1,735 14,498,441 673,202
Deck rehabilitation/replacement 26 $383 571,348 175,047
Other structural work 476 $1,487 6,624,928 523,046
Total 1,606 $5,256 32,013,662 1,896,410

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.

38
Compared to 37 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
37. Washington 4.8%
38. Maryland 4.7%
39. Oregon 4.6%

38
Compared to 39 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
37. Puerto Rico 282
38. Maryland 253
39. Idaho 238

44
Compared to 44 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
43. Delaware 3.1%
44. Maryland 3.1%
45. Florida 2.6%
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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