Allegheny County Bridge Report Card

Allegheny County scores 62 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D62 / 100

Local infrastructure snapshot

Allegheny County, Pennsylvania

Allegheny County has 1,296 bridges in the National Bridge Inventory, with 120 rated poor and 77 rated scour-critical. Its poor-condition share of 9.3% is at or below the 12.1% statewide average. Poor-condition bridges carry about 763,976 daily vehicle crossings.

1,296Total Bridges

120Poor (9.3%)

788Fair (60.8%)

77Scour-Critical

Quote-Ready Local Facts

9.3%of county bridges are in poor condition, compared with 12.1% statewide and 6.7% nationally.

763,976daily vehicle crossings are on poor-condition bridges in the county.

77bridges are rated scour-critical, or 5.9% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Allegheny County a Bridge Condition Exposure Score of 62/100 (D). The county has 1,296 bridges in the National Bridge Inventory, including 120 in poor condition and 77 rated scour-critical. Poor-condition bridges carry about 763,976 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	9.3%	18.5
Poor-condition traffic exposure	25	4.6% of measured traffic	3.4
Scour-critical bridge share	20	5.9%	11.9
Average age vs national baseline	10	58 years vs 48 nationally	4.2
Traffic-data completeness	5	16,638,071 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	9.3%
State Poor-Condition Share	12.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	5.9%
Average Bridge Age	58 years
Poor-Condition Traffic Exposure	763,976 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeParkway East over Old Wm Penn HWY Leak Run — 52,457 vehicles/day Oldest Listed BridgeBeaver RD over Little Sewickley Creek — built in 1841 All County BridgesBrowse every bridge record in Allegheny County.

Top Bridges to Watch in Allegheny County

Bridge	Reason	Condition	Daily Traffic	Year Built
Parkway East over Old Wm Penn HWY Leak Run	Poor condition + traffic exposure	Poor	52,457	1962
Pa Turnpike (i-76) over Plum Creek	Poor condition + traffic exposure	Poor	38,689	1952
Old William Penn over Thompson Run	Poor condition + traffic exposure	Poor	16,904	1924
Universal RD over Plum Creek Upper Branch	Poor condition + traffic exposure	Poor	7,662	1982
Glassport Road over Wylie Run	Poor condition + traffic exposure	Poor	6,411	1905
Mcclaren Road over Branch Of Montour Run	Poor condition + traffic exposure	Poor	6,349	1948
Mcclaren & Main ST over Branch Montour Run	Poor condition + traffic exposure	Poor	6,349	1948
Wall Av over Dirty Camp Run	Poor condition + traffic exposure	Poor	5,000	1900
Monongahela Road over Beckets Run	Poor condition + traffic exposure	Poor	4,603	1915
Mclaughlin Run RD over Mclaughlin Run	Poor condition + traffic exposure	Poor	3,740	1900

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.