National Bridge Inventory: Maryland



  • Of the 5,357 bridges in the state, 274, or 5.1 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 305 bridges classified as structurally deficient in 2014.
  • 14 of the structurally deficient bridges are on the Interstate Highway System.
  • 489 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,634 bridges at an estimated cost of $3.5 billion.
  • This compares to 1,660 bridges that needed work in 2014.

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
Prince George's 1963 177,270 Urban Interstate IS 95 IL over Suitland Road
Prince George's 1963 177,270 Urban Interstate IS 95 OL over Suitland Road
Baltimore 1950 113,761 Urban Interstate IS 83 NBR over Padonia Road
Frederick 1950 109,670 Urban Interstate IS 270 NB over MD 85
Frederick 1950 109,670 Urban Interstate IS 270 SB over MD 85
Baltimore 1965 72,000 Urban Interstate Perring Pkwy Ramp over Herring Run
Baltimore 1951 69,930 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 1964 62,680 Urban Interstate IS 70 WB over IS 81
Baltimore 1921 58,858 Urban other principal arterial Pulaski Highway over Herring Run
Baltimore 1963 46,276 Urban other principal arterial Russell Street over CSX
Frederick 1957 42,640 Urban freeway/expressway US 15 NBR over MD 26
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
Montgomery 1955 29,923 Urban local road Bel Pre Road over Bel Pre Creek
Montgomery 1985 29,000 Urban local road Gude Drive West over I-270
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
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 188 235,585 8,907,508 0 0 0
Rural arterial 173 316,398 3,709,828 4 2,112 40,820
Rural minor arterial 219 125,119 1,755,448 11 4,565 94,291
Rural major collector 357 164,538 1,525,672 21 4,356 89,177
Rural minor collector 491 121,865 960,966 30 6,639 52,790
Rural local road 1,015 191,132 952,671 98 12,022 61,393
Urban Interstate 696 1,829,995 54,374,536 14 35,817 1,736,385
Urban freeway/expressway 430 850,231 19,173,229 4 2,859 85,901
Urban other principal arterial 455 710,199 11,844,002 16 47,327 419,516
Urban minor arterial 331 323,354 4,844,674 12 11,101 107,006
Urban collector 296 153,561 2,171,621 12 2,990 120,232
Urban local road 706 404,533 5,911,307 52 44,992 471,520
Total 5,357 5,426,511 116,131,462 274 174,778 3,279,031
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 323 $1,064 7,567,949 322,407
Widening & rehabilitation 202 $307 2,861,677 191,147
Rehabilitation 609 $1,120 14,784,475 684,069
Deck rehabilitation/replacement 22 $352 354,416 172,437
Other structural work 478 $688 5,621,720 523,292
Total 1,634 $3,531 31,190,237 1,893,352

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.

37
from 36 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
36. Oregon 5.2%
37. Maryland 5.1%
38. Minnesota 5.0%

39
from 39 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
38. Connecticut 308
39. Maryland 274
40. Puerto Rico 273
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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