County profile · official public datasets

Somerset County, PA

454 public highway bridges tracked in the FHWA National Bridge Inventory: 33% rated Good, 52.6% Fair, 14.3% Poor.

454
Public bridges
33%
Good condition
14.3%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Somerset County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

47th
of 67 on Poor share
14.3%
Poor-condition share
454
public highway bridges
1969
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Somerset County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Somerset County ranks #47 of 67 Pennsylvania counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 14.3%). Somerset County, Pennsylvania contains 454 public highway bridges. Roughly 33% are rated “Good,” 52.6% “Fair,” and 14.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

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

Total bridges

454

Public highway bridges in Somerset County

Good condition

33%

150 of 454 rated 7-9

Fair condition

52.6%

239 of 454 rated 5-6

Poor condition

14.3%

65 of 454 rated 4 or below

In-state Poor-share rank

#47 of 67

Among Pennsylvania counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 454 NBI-tracked bridges by lowest applicable component rating.

Good
33% (150)
Fair
52.6% (239)
Poor
14.3% (65)

Somerset County's Poor-condition bridges carry 28,299 vehicle crossings a day

That is 2.3% of the county's reported daily bridge traffic on 14.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 442 crossings a day against 2,704 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 453 of 454 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

56.6% of Somerset County's bridges have passed the 50-year mark

257 of the 454 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 33% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 22.4% of the county's Poor-condition bridge traffic

US 219 SBL over T685 MILLER ROAD, built 1969, carries 6,344 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 65-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 28,299 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Somerset County's bridges were built

454 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 80 of the county's bridges still in the inventory were built, which is 17.6% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year (1969) matches the Pennsylvania average (1970).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Somerset County compares with Pennsylvania's closest counties by inventory size

The 5 Pennsylvania counties nearest Somerset County in number of bridges, with their condition splits. Its 14.3% Poor share is the 4th-lowest of these 6. Its average build year of 1969 against a peer-group mean of 1974 is 5 years older.

Showing the 5 closest of 66 Pennsylvania counties eligible for comparison.

Bridge inventory size and condition shares for Somerset County and the 5 Pennsylvania counties closest to it in inventory size
County Bridges Poor
Luzerne County 457 25.6%
Somerset County (this page) 454 14.3%
Dauphin County 449 8.5%
Erie County 442 9.5%
Mercer County 438 15.5%
Tioga County 429 3.3%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Somerset County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Somerset County, both outside Pennsylvania so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside PA (454 bridges here).

Similar average build year

Nearest mean year-built outside PA (1969 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 454 Good 150 Fair 239 Poor 65

All bridges (454)

SR 3001

Fair

Over: McCLINTOCK RUN

1 MI.S.OF FORT HILL, Somerset, PA

Built 1935 Load: 49.9 t ADT: 185

SR 3047

Fair

Over: LAUREL HILL CREEK

URSINA BOROUGH, Somerset, PA

Built 1941 Load: 49.9 t ADT: 706

PA TPK (I76) EB

Fair

Over: SR 1015; (LR55051)

WEST OF NEW BALTIMORE, Somerset, PA

Built 1980 Load: 49.9 t ADT: 30,600

US 30

Fair

Over: CSX RAILROAD

KANTNER, Somerset, PA

Built 2010 Load: 49.9 t ADT: 3,849

T539 BALTZER BR RD

Fair

Over: STONYCREEK RIVER

1 MI.S.OF SHANKSVILLE, Somerset, PA

Built 1989 Load: 50.8 t ADT: 50

PA 281

Fair

Over: LAUREL HILL CREEK

.2 MI.N.OF URSINA BORO, Somerset, PA

Built 1994 Load: 52.6 t ADT: 1,495

SR 4006

Fair

Over: QUEMAHONING CREEK

ACOSTA, Somerset, PA

Built 1915 Load: 52.6 t ADT: 524

T733 KEAFER HILL R

Fair

Over: BENS CREEK

2.1 MI.N.OF THOMAS MILLS, Somerset, PA

Built 1900 Load: 52.6 t ADT: 150

SR 2005

Fair

Over: ELK LICK CREEK

2 MI.W.OF SUMMIT MILLS, Somerset, PA

Built 1939 Load: 54.4 t ADT: 333

PA TPK (I-76)

Fair

Over: SR 0160 (LR 55045)

WEST OF ALLEGHENY TUNNEL, Somerset, PA

Built 1939 Load: 54.4 t ADT: 29,452

SR 2005

Fair

Over: TR.ELK LICK CREEK

.5 MI.W.OF SUMMIT MILLS, Somerset, PA

Built 1937 Load: 55.3 t ADT: 333

US 219 NBL

Fair

Over: PA 281

2 MI. NE OF SOMERSET, Somerset, PA

Built 1973 Load: 56.2 t ADT: 5,453

SR 2020

Fair

Over: BRUSH CREEK

2 MI.NW.OF FAIRHOPE, Somerset, PA

Built 1962 Load: 56.2 t ADT: 87

SR 1005 (LR 548)

Fair

Over: PTC B-426 MP 118.21

1.02 MILE N. FROM PA 31, Somerset, PA

Built 2001 Load: 56.2 t ADT: 324

SR 1002

Fair

Over: BUCK RUN

3 MI.S.OF FRIEDENS, Somerset, PA

Built 1961 Load: 57.2 t ADT: 271

SR 1003 (LR55123)

Fair

Over: PA TURNPIKE(I-76);B-482

1 MI.NORTH OF BROTHERTON, Somerset, PA

Built 2000 Load: 57.2 t ADT: 982

SR 1033

Fair

Over: TRIB SEESE RUN

RUMMEL, Somerset, PA

Built 1991 Load: 59.0 t ADT: 1,747

US 219 SBL

Fair

Over: SR 8005 RAMPS C & D

OVER SR 8005, Somerset, PA

Built 2003 Load: 59.0 t ADT: 6,344

SR 2005

Fair

Over: ELK LICK CREEK

1 MI.W.OF SUMMIT MILLS, Somerset, PA

Built 1939 Load: 59.9 t ADT: 333

SR 1018

Fair

Over: BEAVERDAM RUN

3 MI.E.OF CENTRAL CITY, Somerset, PA

Built 1938 Load: 60.8 t ADT: 220

SR 4027

Fair

Over: SOUTH FORK BENS CREEK

FORWARDSTOWN, Somerset, PA

Built 1938 Load: 60.8 t ADT: 181

SR 2011

Fair

Over: RAILS TO TRAILS

1 MI. SE OF DEAL(LOBSTOR), Somerset, PA

Built 2005 Load: 61.7 t ADT: 502

T860 LAUREL RUN RD

Fair

Over: TRIB. LAUREL HILL CREEK

1.7 MI.NW.OF LAVANSVILLE, Somerset, PA

Built 1934 Load: 63.5 t ADT: 62

T-612 Cranberry Rd

Fair

Over: PA TPK (I-76)

WEST OF BROTHERTON, Somerset, PA

Built 1994 Load: 63.5 t ADT: 200

SR 1011

Fair

Over: WELLS CREEK

LISTIE, Somerset, PA

Built 1939 Load: 64.4 t ADT: 333

SR 2027

Fair

Over: BUFFALO CREEK

1.5 MI.SW.OF BERLIN, Somerset, PA

Built 1941 Load: 64.4 t ADT: 296

PA 56

Fair

Over: RUMMEL RUN

1 MI.E.OF WINDBER, Somerset, PA

Built 1959 Load: 65.3 t ADT: 4,460

T858 BRADDOCKS RN

Fair

Over: BRADDOCKS RUN

2.5 MI.W.OF ADDISON, Somerset, PA

Built 1959 Load: 70.8 t ADT: 50

PA TPK (I-76)

Fair

Over: STONYCREEK RIVER

NEAR BROTHERTON, Somerset, PA

Built 2004 Load: 71.7 t ADT: 29,452

PA TPK (I-76)

Fair

Over: TRIB TO COXES CREEK

EAST OF SOMERSET INTER., Somerset, PA

Built 1939 Load: 80.7 t ADT: 30,880

SR 3029

Fair

Over: LAUREL HILL CREEK

VILLAGE OF TRENT, Somerset, PA

Built 1963 Load: 85.3 t ADT: 1,719

PA 160

Fair

Over: LAUREL RUN

3 MI.NW.OF WELLERSBURG, Somerset, PA

Built 1963 Load: 88.9 t ADT: 1,528

SR 3006

Fair

Over: SOUTH GLADE RUN

1 MI.W.OF ROCKWOOD, Somerset, PA

Built 1961 Load: 88.9 t ADT: 255

T830 SHAFFER RUN R

Fair

Over: SHAFFERS RUN

4.6 MILE N OF FAIRHOPE, Somerset, PA

Built 1982 Load: 89.7 t ADT: 11

PA TPK (I-76)

Fair

Over: CRAB RUN

EAST OF LAUREL SUMMIT, Somerset, PA

Built 1939 Load: 89.7 t ADT: 31,991

PA TPK (I-76)

Fair

Over: GLADES CREEK

EAST OF BROTHERTON, Somerset, PA

Built 1939 Load: 89.7 t ADT: 29,452

PA TPK (I-76)

Fair

Over: TRIB. TO STONY CREEK

WEST OF ALLEGHENY TUNNEL, Somerset, PA

Built 1939 Load: 89.7 t ADT: 29,452

PA TPK (I-76)

Fair

Over: T-782

NEAR NEW BALTIMORE, Somerset, PA

Built 1939 Load: 89.7 t ADT: 31,200

PA 985

Fair

Over: QUEMAHONING CREEK

5 MI.N.OF SOMERSET, Somerset, PA

Built 1949 Load: 99.8 t ADT: 3,155

US 30

Good

Over: QUEMAHONING CREEK

FERRELLTON, Somerset, PA

Built 2006 Load: 20.9 t ADT: 5,205

SR 3023

Good

Over: COXES CREEK

.3 MI.N.OF BANDO, Somerset, PA

Built 1973 Load: 24.5 t ADT: 134

US 219 NBL

Good

Over: PA 403

OVER PA 403, Somerset, PA

Built 1969 Load: 26.3 t ADT: 7,439

SR 1002

Good

Over: WELLS CREEK

FRIEDENS, Somerset, PA

Built 1949 Load: 30.8 t ADT: 271

T-353 MOSER ROAD

Good

Over: CASSELMAN RIVER

2 MI.NE.OF SALISBURY, Somerset, PA

Built 1900 Load: 30.8 t ADT: 50

SR 4009 Husband Rd

Good

Over: PTC B-504 MP 108.17

PTC B-504 MP 108.17, Somerset, PA

Built 2015 Load: 32.4 t ADT: 2,470

SR 1003

Good

Over: WELLS CREEK

0.5 MILE WEST OF LISTIE, Somerset, PA

Built 2013 Load: 32.7 t ADT: 977

PA 403

Good

Over: STONYCREEK RIVER

0.29 MILE N. FROM US 30, Somerset, PA

Built 2013 Load: 32.7 t ADT: 1,033

SR 4015

Good

Over: BR QUEMAHONING CREEK

QUECREEK, Somerset, PA

Built 2016 Load: 32.7 t ADT: 350

T-858 Mt. Zion Rd

Good

Over: Kooser Run

Bakersville, Somerset, PA

Built 2017 Load: 32.7 t ADT: 50

US 219

Good

Over: SR2027 & TRIB CASSELMAN

PINE HILL NB, Somerset, PA

Built 2018 Load: 32.7 t ADT: 2,137

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

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.