National Bridge Inventory: Pennsylvania



  • Of the 22,965 bridges in the Commonwealth, 3,353, or 14.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 4,430 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 7.9 percent of total deck area on all structures.
  • 101 of the structurally deficient bridges are on the Interstate Highway System. A total of 90.3 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.
  • 2,164 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 11,946 bridges at an estimated cost of $20.7 billion.
  • This compares to 12,848 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Philadelphia 1967 203,528 Urban Interstate Interstate 95 over Comly Street
Philadelphia 1967 203,528 Urban Interstate Interstate 95 over Fraley Street
Philadelphia 1965 182,092 Urban Interstate Delaware Expway. over Sergeant & Huntingdon St
Philadelphia 1971 182,092 Urban Interstate Delaware Expway. over Palmer-Cumberland Strs.
Philadelphia 1968 163,599 Urban Interstate Interstate 95 over earth fill & sewer access
Philadelphia 1965 128,681 Urban Interstate Delaware Expway. over Venango Street
Philadelphia 1965 128,681 Urban Interstate Delaware Expway. over Wheatsheaf Lane
Montgomery 1952 98,451 Urban Interstate Schuylkill Expway. over Righters Ferry Road
Philadelphia 1960 86,820 Urban freeway/expressway Roosevelt Blvd Ext over Roberts Ave;Septa;CSX
Chester 1961 76,364 Urban freeway/expressway Route 30 By-Pass over Creek Road;Brandywine Cr
Bucks 1954 69,245 Urban freeway/expressway Lincoln Highway over Ramp E,F to Turnpike
Bucks 1967 69,245 Urban freeway/expressway Lincoln Highway over Street Road
York 1959 69,203 Urban Interstate I-83; SR 83 over Norfolk Souther RR
York 1959 69,203 Urban Interstate I-83; SR 83 over Norfolk Southern RR
York 1959 66,792 Urban Interstate I-83; SR 83 over 22/Springwood Rd
Berks 1963 66,739 Urban freeway/expressway SR 422 (Lr793) over Thun Recreational Trail
Bucks 1967 64,157 Urban freeway/expressway New US-1 By-Pass over CSX/Septa, Sr2037 Spur B
Berks 1963 63,761 Urban freeway/expressway SR 422(LR 793) over Schuylkill River
Luzerne 1941 59,856 Urban freeway/expressway Tr 309, I-81 Ramps over Laurel Run Creek
York 1959 55,237 Urban Interstate I-83; SR 83 over US 30; SR 30
York 1957 55,237 Urban Interstate 83 over 181 George St
Dauphin 1969 53,659 Urban freeway/expressway Pa 283; SR 03 over I-283; SR 0283
Montgomery 1955 50,307 Urban Interstate Pa Tpk (I-476) over SR 1018, Lr46038
Montgomery 1955 50,307 Rural Interstate Pa Tpk (I-476) over Perkiomen Creek
Lehigh 1988 48,891 Urban other principal arterial SR 309(LR 153) over I-78 (LR 1045)
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 1,043 1,012,091 18,648,659 34 30,370 829,240
Rural arterial 980 1,032,033 7,844,546 34 11,690 363,291
Rural minor arterial 1,463 544,934 5,426,795 143 27,690 435,254
Rural major collector 1,899 584,823 3,122,678 191 50,354 308,702
Rural minor collector 2,047 419,482 1,475,669 288 49,094 217,180
Rural local road 7,180 1,130,152 2,856,886 1,667 206,237 562,372
Urban Interstate 1,448 3,003,060 56,274,079 67 142,603 2,916,078
Urban freeway/expressway 924 1,337,559 25,016,104 34 59,175 1,146,542
Urban other principal arterial 1,445 1,849,180 23,348,595 161 176,458 2,666,207
Urban minor arterial 1,516 1,088,860 13,880,390 180 108,600 1,635,816
Urban collector 1,449 601,271 5,868,770 202 55,693 794,300
Urban local road 1,571 597,422 3,867,282 352 111,234 728,546
Total 22,965 13,200,867 167,630,453 3,353 1,029,198 12,603,528
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,861 $1,588 5,149,746 400,509
Widening & rehabilitation 113 $443 815,011 155,840
Rehabilitation 7,506 $14,554 67,642,230 5,195,676
Deck rehabilitation/replacement 945 $1,728 6,371,367 623,187
Other structural work 1,521 $2,368 8,027,817 854,922
Total 11,946 $20,682 88,006,171 7,230,135

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.

5
Compared to 5 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
4. South Dakota 17.7%
5. Pennsylvania 14.6%
6. Maine 12.7%

2
Compared to 2 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
2. Pennsylvania 3,353
3. Illinois 2,374

12
Compared to 16 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
11. Louisiana 8.0%
12. Pennsylvania 8.0%
13. Wyoming 8.0%
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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