Allegheny County, PA

356 public highway bridges

Allegheny County Bridge Snapshot

Allegheny County, Pennsylvania contains 356 public highway bridges in the FHWA National Bridge Inventory. Roughly 48.9% are rated “Good,” 21.3% “Fair,” 4.5% “Poor,” and 4.5% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in PA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

356
Total Bridges
48.9%
Good
4.5%
Poor
4.5%
Structurally Deficient

Condition Distribution

Good
48.9% (174)
Fair
21.3% (76)
Poor
4.5% (16)
SD
4.5% (16)

All Bridges (356)

CURRY HOLLOW RD

Good

Over: CSX OWNED

PLEASANT HILLS-OVER RR, Allegheny, PA

Built 2012 Load: 39.9 t ADT: 24,259

WEST SMITHFIELD ST

Good

Over: TRIB TO YOUGH RIVER

2082 FEET SW OF SR 48, Allegheny, PA

Built 2016 Load: 40.2 t ADT: 1,273

S 27th Street

Good

Over: CSX Railroad Tunnel

0.2 MI NW of Hot Metal Br, Allegheny, PA

Built 2002 Load: 40.2 t ADT: 1,500

PA TPK (I-76)

Good

Over: PA TPK (Ramp BC)

Allegheny Valley Interch, Allegheny, PA

Built 2011 Load: 40.5 t ADT: 46,240

RAMP D

Good

Over: ADJ TO NORFOLK SOUTHERN

31ST ST/RT 28 RAMP D, Allegheny, PA

Built 2013 Load: 40.5 t ADT: 2,416

GIBSONIA RD

Good

Over: DEER CREEK

250' SOUTH OF SR 1020, Allegheny, PA

Built 2017 Load: 40.5 t ADT: 3,925

SAXONBURG BLVD

Good

Over: LITTLE PINE CREEK

4283' N.E. OF SR 0008, Allegheny, PA

Built 2017 Load: 40.5 t ADT: 3,085

G. BUENA VISTA RD

Good

Over: WILDCAT RUN

AT ROCK RUN RD, Allegheny, PA

Built 2018 Load: 40.5 t ADT: 1,847

BIG SEWICKLEY C RD

Good

Over: BR.BIG SEWICKLEY CREEK

@ INTERSECTION W/SR 4040, Allegheny, PA

Built 1926 Load: 40.8 t ADT: 6,950

SR 28 SB

Good

Over: CSX (AVRR)

500' S of Etna interchng, Allegheny, PA

Built 2009 Load: 40.8 t ADT: 30,365

BULL CREEK RD

Good

Over: BULL CREEK

4200' S.E. OF SR 1033, Allegheny, PA

Built 2015 Load: 40.8 t ADT: 2,964

Dambach Ave

Good

Over: Breakneck Creek

200' N Int w/ Valencia Rd, Allegheny, PA

Built 2013 Load: 40.8 t ADT: 100

Bg Swkly Crk Rd

Good

Over: Big Sewickley Creek

0.6 Mi. NW of SR 4045, Allegheny, PA

Built 2020 Load: 40.8 t ADT: 5,239

Mill Hill Rd

Good

Over: Wylie Run

@ INTER. WITH SR 2010, Allegheny, PA

Built 2016 Load: 41.1 t ADT: 1,592

LINCOLN HWY(US 30)

Good

Over: Montour Run

400 FEET SE OF SR 3070, Allegheny, PA

Built 2016 Load: 41.5 t ADT: 5,934

Lincoln Hwy

Good

Over: LONG RUN

1260' East of Rte 48, Allegheny, PA

Built 2010 Load: 41.7 t ADT: 14,106

MILL ST

Good

Over: ROBINSON RUN SOUTH BRANC

RS03 ROBINSON RUNSBR #3, Allegheny, PA

Built 2022 Load: 41.7 t ADT: 323

Lebanon Rd.

Good

Over: Union RR

2000' N. OF AIRPORT RUNWA, Allegheny, PA

Built 2014 Load: 41.8 t ADT: 18,569

SOUTH BEND LANE

Good

Over: CHALFONT RUN

500' SO. OF BUS. RT.22, Allegheny, PA

Built 2020 Load: 41.8 t ADT: 1,407

Brodhead Rd

Good

Over: Flaugherty Run

@ Interchange w/ SR 3089, Allegheny, PA

Built 2012 Load: 42.1 t ADT: 6,100

Lesnett Road

Good

Over: McLaughlin Run

100' W of Int. w/ SR 3004, Allegheny, PA

Built 2017 Load: 42.1 t ADT: 8,079

PA TPK (I-76)

Good

Over: SR 4052, LR 02225

East of Warrendale, Allegheny, PA

Built 2012 Load: 42.4 t ADT: 31,140

10TH ST BYPASS

Good

Over: PEDESTRIAN WALKWAY

149 Fort Duquesne Blvd Br, Allegheny, PA

Built 2002 Load: 42.6 t ADT: 23,748

Bakerstown Road

Good

Over: B&LE RR

@ INTERSECTION W/ SR 1013, Allegheny, PA

Built 2016 Load: 43.1 t ADT: 5,371

SAW MILL RUN BLVD

Good

Over: WEYMAN RUN

250' SOUTHEAST OF SR 0088, Allegheny, PA

Built 2015 Load: 43.4 t ADT: 28,859

East Pennview St.

Good

Over: Pine Creek

PI11 Pine Creek #11, Allegheny, PA

Built 2017 Load: 43.4 t ADT: 4,234

MCFARREN ST.

Good

Over: Nine Mile Run

094 MCFARREN ST BRIDGE, Allegheny, PA

Built 2020 Load: 43.4 t ADT: 150

RAMP T

Good

Over: ELDER ST, TURTLE CRK, RR

TriBoro Expressway, Allegheny, PA

Built 2013 Load: 43.7 t ADT: 3,181

Thorn Hill Dr.

Good

Over: Brush Creek

BH03 Brush Creek No. 3, Allegheny, PA

Built 2015 Load: 43.7 t ADT: 2,764

Brownshill Road

Good

Over: Little Pine Creek

112001 O'HARA TWP, Allegheny, PA

Built 2019 Load: 43.7 t ADT: 1,765

Log Cabin Rd

Good

Over: Little Deer Creek

70' West of SR 1015, Allegheny, PA

Built 2015 Load: 44.4 t ADT: 433

Mosside Blvd

Good

Over: NORFOLKSOUTH, TURTLE CRK

W of Pitcarin@SR 130 Int, Allegheny, PA

Built 2007 Load: 44.5 t ADT: 8,021

S. LINDEN ST.

Good

Over: N-S RR

FO02 Duquesne Flyover, Allegheny, PA

Built 2009 Load: 44.5 t ADT: 434

DORRINGTON RD

Good

Over: ROBINSON RUN

.25 MI S. OF SR3048, Allegheny, PA

Built 2010 Load: 44.5 t ADT: 837

HAYDEN BLVD (SR51)

Good

Over: FALLEN TIMBER RUN

@ INTER.W/WEIGLE HILL RD., Allegheny, PA

Built 2018 Load: 45.0 t ADT: 18,567

HOPE HOLLOW RD

Good

Over: GEORGES RUN

GR01 GEORGE'S RUN NO. 1, Allegheny, PA

Built 1930 Load: 45.4 t ADT: 10,819

CENTER ST

Good

Over: PAT BR LOC 9054

439001 N/OXBOW/SMILAX ST, Allegheny, PA

Built 1996 Load: 45.4 t ADT: 2,363

RELOCATED FT PITT

Good

Over: MON WHARF FLOOD WALLS

150 Fort Pitt Blvd (Wood, Allegheny, PA

Built 2002 Load: 45.4 t ADT: 13,800

OAK RD

Good

Over: DAWSON RUN

1/2 MILE FR TR 910, Allegheny, PA

Built 2012 Load: 45.4 t ADT: 6,102

Library Rd.

Good

Over: Weyman Run

SR51 and 88 Intersection, Allegheny, PA

Built 2015 Load: 45.4 t ADT: 21,171

RAMP 79S_576E

Good

Over: PA TPK (0576)

South Fayette Twp, Allegheny, PA

Built 2020 Load: 45.7 t

HERRON AV

Good

Over: LOWRIES RUN

75' S OF RT 65, Allegheny, PA

Built 2013 Load: 46.0 t ADT: 1,000

SR 2055

Good

Over: Pa Turnpike I-76

NEAR BOYCE PARK, Allegheny, PA

Built 2022 Load: 46.0 t ADT: 4,040

SR 48 SB

Good

Over: N & S RR, Turtle Creek

South of SR 130 Intersect, Allegheny, PA

Built 2006 Load: 46.3 t ADT: 8,021

Idlewood Avenue

Good

Over: Whiskey Run

Idlewood Avenue, Allegheny, PA

Built 2018 Load: 46.3 t ADT: 175

Ohio River Blvd

Good

Over: Lowries Run

Emsworth Boro, Allegheny, PA

Built 2011 Load: 46.7 t ADT: 21,180

GIBSON ST

Good

Over: LOWRIES RUN

429003 OFFCAMP HORNE RD E, Allegheny, PA

Built 2015 Load: 46.7 t ADT: 100

Lardington Road

Good

Over: Bull Creek

350' N OF SR 1034, Allegheny, PA

Built 2019 Load: 46.7 t ADT: 569

FLAUGHERTY RUN RD

Good

Over: FLAUGHERTY RUN

2 MI NE OF SR 60, Allegheny, PA

Built 2009 Load: 47.2 t ADT: 7,401

Calmwood Drive

Good

Over: East Little Pine Creek

1.3 Mi. SW of Glenshaw, Allegheny, PA

Built 2010 Load: 47.2 t ADT: 100

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial