National Bridge Inventory: Pennsylvania Congressional District 17


  • Of the 1,957 bridges in the counties of this district, 288, or 14.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 414 bridges classified as structurally deficient in 2014.
  • 121 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • Repairs are needed on 1,124 bridges in the district, which will cost an estimated $2.2 billion.

County Year Built Daily Crossings Type of Bridge Location
Allegheny 1928 42,061 Urban other principal arterial Liberty Bridge over Mon R,I376,0837,2 Av,Arl
Allegheny 1952 38,689 Rural Interstate Pa Turnpike (I-76) over Little Plum Cr
Allegheny 1942 32,150 Urban other principal arterial Ardmore Bl over Falls Run
Allegheny 1950 27,314 Urban Interstate Pa Tpk (I-76) over SR 19, US19
Butler 1970 26,326 Urban Interstate Sr79 SB over T-311 N Boundary Rd
Allegheny 1951 25,754 Urban other principal arterial Eliz. Br Sr51 over Sr837 21 CSX Ns Mon Ri
Allegheny 1985 25,212 Urban other principal arterial Washington Av over Chartiers Creek
Butler 1970 24,599 Urban Interstate SR 79 NB over Twp. Rd. 311 Boundary Rd
Allegheny 1932 24,350 Urban other principal arterial Wm.Flynn Hw over West Branch Deer Creek
Allegheny 1984 22,792 Urban freeway/expressway SR 28 SH over Lr 02276-Bull Creek Road
Beaver 1952 22,663 Rural Interstate Pa Tpk (I-76) over Brush Creek
Allegheny 1926 22,462 Urban minor arterial Ninth Street Br over Allegh Riv,10 St By-Pass
Allegheny 1942 21,311 Urban other principal arterial SR 51 over Fallen Timber Run
Allegheny 1938 21,211 Urban other principal arterial Blvd of The Allies over CSX RR & Bike Trail
Allegheny 1905 21,000 Urban local road N Ave&Brighton Rd over N-S RR-Allegheny Park
Allegheny 1972 18,889 Urban minor arterial Noblestown Road over Robinson Run
Allegheny 1962 17,850 Urban Interstate Ramp H Rd. over Forbes,Diamond,& 6th Ave
Allegheny 1930 17,488 Urban other principal arterial Ohio River Blvd over Spruce Run Cr.-Spruce St
Butler 1934 17,112 Urban other principal arterial Sr08 over Glade Run
Allegheny 1983 16,041 Urban other principal arterial Connor Rd over Pat Trolley # 9830
Allegheny 1952 15,494 Urban other principal arterial Ramp A,Tarentum Br over 4th Ave,Rampd, Ns RR
Allegheny 1984 15,239 Urban minor arterial Brownsville Rd over W&Le RR
Allegheny 1952 15,102 Urban other principal arterial Tarentum Br,Rmp.B over Ns RR,4th Ave,Ross St
Allegheny 1955 15,049 Urban other principal arterial Painters Run Rd over Painters Run
Allegheny 1910 15,000 Urban other principal arterial Braddock Avenue over Norfolk Southern RR
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 43 49,650 885,534 2 1,164 61,352
Rural arterial 34 35,753 353,646 2 225 12,171
Rural minor arterial 36 10,881 189,373 5 1,147 27,137
Rural major collector 62 21,227 95,301 8 5,918 12,941
Rural minor collector 48 13,944 40,242 13 2,638 10,098
Rural local road 286 42,045 100,227 70 8,474 30,717
Urban Interstate 267 534,500 7,187,763 6 5,427 120,626
Urban freeway/expressway 134 203,384 2,254,691 2 1,634 32,102
Urban other principal arterial 290 512,981 4,879,044 33 59,667 468,289
Urban minor arterial 255 212,516 2,006,230 47 32,653 348,878
Urban collector 146 68,152 642,606 22 8,206 97,023
Urban local road 356 209,355 1,090,262 78 25,604 187,929
Total 1,957 1,914,386 19,724,919 288 152,757 1,409,263
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 121 $94.8 519,413 28,151
Widening & rehabilitation 10 $0.5 34,081 958
Rehabilitation 867 $1,929.1 11,043,250 1,069,036
Deck rehabilitation/replacement 79 $116.3 813,601 77,014
Other structural work 47 $70.0 374,722 47,236
Total 1,124 $2,210.8 12,785,067 1,222,394

Data includes information for the following area(s): Allegheny County, Beaver County, Butler County

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.

5
from 4 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
4. South Dakota 16.7%
5. Pennsylvania 16.6%
6. Maine 13.1%

2
from 2 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
2. Pennsylvania 3,770
3. Oklahoma 2,540
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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