National Bridge Inventory: Maryland

  • The state has identified needed repairs on 1,595 bridges.
  • This compares to 1,646 bridges that needed work in 2019.
  • Over the life of the IIJA, Maryland will receive a total of $440.7 million in bridge formula funds, which will help make needed repairs.
  • Maryland currently has access to $176.3 million of that total, and has committed $18.2 million towards 6 projects as of June 2023.
  • Of the 5,473 bridges in the state, 252, 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 273 bridges classified as structurally deficient in 2019.
  • The deck area of structurally deficient bridges accounts for 2.8 percent of total deck area on all structures.

County Year Built Daily Crossings Type of Bridge Location
Baltimore 1958 188,860 Urban Interstate IS 695 over US 40
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 1966 62,680 Urban Interstate IS 70 WB over MD 632
Washington 1965 62,680 Urban Interstate IS 70 WB over US 11
Washington 1966 62,680 Urban Interstate IS 70 EB over MD 632
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
Baltimore 1961 55,154 Urban other principal arterial Patapsco Avenue WB over Patapsco River
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
Washington 1968 37,200 Rural Interstate IS 70 Ramp A over Beaver Creek
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
Montgomery 1984 31,600 Urban local road Midcounty Hwy & MI over Mill Creek
Baltimore 1962 29,900 Urban Interstate I-83 over Mta Light Rail
Baltimore 1929 28,030 Urban other principal arterial Hanover Street over CSX
Baltimore 1961 27,672 Urban local road Patapsco Avenue EB over Patapsco River
Baltimore 1968 24,180 Urban other principal arterial Broening Highway over Colgate Creek
Anne Arundel 1973 22,351 Urban minor arterial MD 710 over Branch of Back Creek
Baltimore 1981 22,096 Urban local road Perry Hall Blvd over White Marsh Run
Washington 1967 21,909 Urban minor arterial Halfway Boulevard over Norfolk Southern Railroa
Prince George's 1966 21,191 Urban local road Cherry Hill Road over Little Paint Branch
Harford 1963 21,112 Urban other principal arterial US 1 over Winters 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 188 243,275 9,071,961 1 472 37,200
Rural arterial 187 318,937 3,891,180 0 0 0
Rural minor arterial 238 136,224 1,759,779 8 743 11,620
Rural major collector 360 168,206 1,599,377 9 2,367 33,228
Rural minor collector 493 124,324 1,023,271 29 6,190 74,348
Rural local road 1,032 195,536 1,074,592 94 12,270 66,163
Urban Interstate 694 1,843,638 53,284,140 8 17,584 556,890
Urban freeway/expressway 431 849,409 19,075,369 4 2,718 89,913
Urban other principal arterial 423 682,218 11,661,873 16 54,204 453,718
Urban minor arterial 377 348,638 5,316,822 5 2,628 65,800
Urban collector 318 172,674 2,440,244 12 3,179 120,943
Urban local road 732 414,466 5,911,295 66 49,307 508,551
Total 5,473 5,497,548 116,109,903 252 151,661 2,018,374
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 299 $1,819 7,457,774 319,426
Widening & rehabilitation 189 $769 2,703,277 202,140
Rehabilitation 614 $2,446 14,294,238 645,017
Deck rehabilitation/replacement 27 $697 572,733 175,815
Other structural work 466 $1,894 6,820,174 516,590
Total 1,595 $7,626 31,848,196 1,858,989

About the data:

Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on July 3, 2023. 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 2022 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.

Compared to 38 in 2022

in the nation in % of structurally deficient bridges

1. West Virginia 20.0%
38. Ohio 5.0%
39. Maryland 5.0%
40. Tennessee 4.0%

Compared to 38 in 2022

in the nation in # of structurally deficient bridges

1. Iowa 4,558
36. Puerto Rico 294
37. Maryland 252
38. Georgia 239

Compared to 42 in 2022

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 15.0%
43. Hawaii 3.0%
44. Maryland 3.0%
45. Delaware 3.0%
Full State Ranking


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on July 3, 2023. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

    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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