National Bridge Inventory: Maryland



  • Of the 5,430 bridges in the state, 273, or 5.0 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 297 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 3.5 percent of total deck area on all structures.
  • 12 of the structurally deficient bridges are on the Interstate Highway System. A total of 85.7 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.
  • 456 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,619 bridges at an estimated cost of $4.9 billion.
  • This compares to 1,677 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Prince George's 1963 203,660 Urban Interstate IS 95/495 over MD 214
Prince George's 1963 203,660 Urban Interstate IS 95/495 over MD 214
Prince George's 1963 185,190 Urban Interstate IS 95 IL over Suitland Parkway
Prince George's 1963 185,190 Urban Interstate IS 95 OL over Suitland Parkway
Baltimore 1950 113,761 Urban Interstate IS 83 NBR over Padonia Road
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
Baltimore 1958 66,910 Urban Interstate IS 895 over City Streets,B&O,Pa RR
Washington 1968 62,740 Urban Interstate IS 70 EB over MD 65
Washington 1965 62,680 Urban Interstate IS 70 EB over US 11
Washington 1965 62,680 Urban Interstate IS 70 WB 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 34,200 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 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 1900 23,840 Urban other principal arterial Hanover Street over CSX Railroad
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
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 188 235,402 8,892,032 0 0 0
Rural arterial 179 317,441 3,831,036 1 729 10,370
Rural minor arterial 223 135,164 1,732,469 9 1,979 28,206
Rural major collector 354 163,762 1,511,809 13 2,962 50,644
Rural minor collector 492 121,249 985,173 31 5,392 57,806
Rural local road 1,038 193,445 1,026,284 104 12,903 61,987
Urban Interstate 692 1,828,066 53,658,436 12 36,455 1,240,595
Urban freeway/expressway 432 850,737 19,296,103 5 3,845 120,323
Urban other principal arterial 422 687,227 11,563,038 20 55,957 520,303
Urban minor arterial 370 344,870 5,142,719 7 7,569 72,033
Urban collector 306 156,717 2,312,523 13 3,904 140,992
Urban local road 734 416,072 5,802,152 58 49,040 518,774
Total 5,430 5,450,152 115,753,774 273 180,735 2,822,033
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 310 $1,123 7,558,974 323,240
Widening & rehabilitation 188 $446 2,589,355 185,990
Rehabilitation 615 $1,633 14,650,888 682,932
Deck rehabilitation/replacement 25 $403 440,580 173,267
Other structural work 481 $1,279 6,511,726 524,934
Total 1,619 $4,883 31,751,523 1,890,363

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.

37
Compared to 37 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
36. Ohio 5.1%
37. Maryland 5.0%
38. Washington 5.0%

39
Compared to 39 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
38. Puerto Rico 282
39. Maryland 273
40. Connecticut 248

42
Compared to 44 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
41. Ohio 3.0%
42. Maryland 3.0%
43. Delaware 3.0%
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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