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 4013

Good

Over: N BR QUEMAHONING CREEK

3 MI SW OF JENNERSTOWN, Somerset, PA

Built 2015 Load: 38.6 t ADT: 107

SR 3025

Good

Over: CSX RAILROAD

0.5 MI S OF SOMERSET, Somerset, PA

Built 2016 Load: 38.6 t ADT: 1,354

US 219

Good

Over: SWAMP CREEK

SWAMP CREEK NB, Somerset, PA

Built 2018 Load: 38.6 t ADT: 2,137

US 219

Good

Over: SWAMP CREEK

SWAMP CREEK SB, Somerset, PA

Built 2018 Load: 38.6 t ADT: 2,038

SR 2023

Good

Over: BUFFALO CREEK

SALCO, Somerset, PA

Built 2014 Load: 38.9 t ADT: 176

PA 669

Good

Over: CASSELMAN RIVER

SALISBURY, Somerset, PA

Built 2014 Load: 38.9 t ADT: 1,576

PALO ALTO RD

Good

Over: POWDER RUN

.5 MI.E.OF GLADDENS, Somerset, PA

Built 2016 Load: 38.9 t ADT: 263

US 219

Good

Over: SR 2031

3.1 MILE NE OF GARRETT, Somerset, PA

Built 2018 Load: 38.9 t ADT: 2,137

US 219

Good

Over: SR 2031

3.1 MILE N OF GARRETT, Somerset, PA

Built 2018 Load: 38.9 t ADT: 2,038

US 219 SBL

Good

Over: T893 MILOW-KIMMER ROAD

3.0 MILE SOUTH OF TR 30, Somerset, PA

Built 2001 Load: 39.0 t ADT: 6,344

SR 4017

Good

Over: BEAVER DAM CREEK

0.1 MI. SE FROM SR 4004, Somerset, PA

Built 1937 Load: 39.0 t ADT: 216

PA TPK (I-76)

Good

Over: BRANCH COXES CRK

NEAR SOMERSET INTERCHANGE, Somerset, PA

Built 2004 Load: 39.0 t ADT: 32,134

US 219 NBL

Good

Over: T893 MILOW-FIMMER ROAD

3 MI S OF SR30, Somerset, PA

Built 2002 Load: 39.0 t ADT: 6,276

SR 1008

Good

Over: STONYCREEK RIVER

MOSTOLLER, Somerset, PA

Built 2014 Load: 39.2 t ADT: 817

US 219

Good

Over: T-519 WALTERS MILL RD

1.4 MILE SOUTH OF US 30, Somerset, PA

Built 2018 Load: 39.2 t ADT: 2,419

US 219

Good

Over: T-519 WALTERS MILL RD

1.4 MILE SOUTH OF US 30, Somerset, PA

Built 2018 Load: 39.2 t ADT: 2,427

Findlay Street

Good

Over: PA TPK (I-76)

New Baltimore, Somerset, PA

Built 2015 Load: 39.5 t ADT: 250

PA 160

Good

Over: LITTLE DARK SHADE CREEK

CENTRAL CITY BORO., Somerset, PA

Built 2000 Load: 39.9 t ADT: 2,823

T-583 DUCK POND RD

Good

Over: LAUREL HILL CREEK

2 MI. NE. of BAKERSVILLE, Somerset, PA

Built 2010 Load: 39.9 t ADT: 75

SR 2047

Good

Over: BLUELICK CREEK

1.3 MI N OF MEYERSDALE, Somerset, PA

Built 2015 Load: 40.2 t ADT: 1,918

Glades Pk (SR 31)

Good

Over: SANDY HOLLOW CREEK

0.5 MI EAST OF SR 1005, Somerset, PA

Built 2017 Load: 40.2 t ADT: 3,931

Listonburg Rd

Good

Over: WHITES CREEK

LISTONBURG, Somerset, PA

Built 2017 Load: 40.2 t ADT: 1,337

T-504 BENDER BR RD

Good

Over: ELKLICK CREEK

2 MI.W.OF MEYERSDALE, Somerset, PA

Built 2023 Load: 40.2 t ADT: 46

SR 2004

Good

Over: ELK LICK CREEK

.5 MI W OF MEYERSDALE, Somerset, PA

Built 2015 Load: 40.5 t ADT: 1,257

SR 1001

Good

Over: SCHROCK RUN

1 MI. W. OF SHANKSVILLE, Somerset, PA

Built 2008 Load: 40.8 t ADT: 1,643

PA 403

Good

Over: FALLEN TIMBER RUN

HOOVERSVILLE, Somerset, PA

Built 2019 Load: 41.1 t ADT: 1,164

SR 3010

Good

Over: COXES CREEK

BANDO, Somerset, PA

Built 2008 Load: 41.7 t ADT: 404

PA 653

Good

Over: SOUTH GLADE CREEK

1.4 MI S NEW CENTERVILLE, Somerset, PA

Built 2008 Load: 41.7 t ADT: 2,196

SR 4013

Good

Over: BEAMS RUN

3 MI. SW. OF JENNERSTOWN, Somerset, PA

Built 2009 Load: 41.7 t ADT: 107

PA 601 (LR 269)

Good

Over: PA TPK I-76

SOMERSET, Somerset, PA

Built 2019 Load: 41.8 t ADT: 12,782

PA 160

Good

Over: DARK SHADE CREEK

0.21 MILES SOUTH OF MAIN, Somerset, PA

Built 2021 Load: 41.8 t ADT: 2,612

PA 160(GRAHAM AVE)

Good

Over: PAINT CREEK

WINDBER BORO, Somerset, PA

Built 1963 Load: 42.6 t ADT: 5,704

SR 2004

Good

Over: CASSELMAN RIVER

MEYERSDALE, Somerset, PA

Built 1951 Load: 42.6 t ADT: 1,232

T-816 CRUMB ROAD

Good

Over: ROARING FORK

3.7 MI.SE.OF WINDBER, Somerset, PA

Built 1940 Load: 42.8 t ADT: 50

LISTONBURG RD

Good

Over: BECKET RUN

4 MI SE OF CONFLUENCE, Somerset, PA

Built 2017 Load: 43.1 t ADT: 1,368

SR 2009

Good

Over: FLAUGHERTY CREEK

WARREN MILLS, Somerset, PA

Built 1996 Load: 43.5 t ADT: 328

T850 SHAFFER RUN R

Good

Over: SHAFFERS RUN

2.6 MILE N OF FAIRHOPE, Somerset, PA

Built 1984 Load: 43.5 t ADT: 11

PA 985

Good

Over: BEAVER DAM CREEK

0.5 MI. N. OF JENNERSTOWN, Somerset, PA

Built 2009 Load: 43.5 t ADT: 1,710

US 30

Good

Over: STONYCREEK RIVER

KANTNER, Somerset, PA

Built 2010 Load: 43.5 t ADT: 5,236

US 30

Good

Over: TRIB STONYCREEK RIVER

0.07 MILE W. FROM PA 403, Somerset, PA

Built 2010 Load: 43.5 t ADT: 5,236

SR 1003

Good

Over: PAINT CREEK

WINDBER, Somerset, PA

Built 2001 Load: 44.5 t ADT: 2,299

SR 1018

Good

Over: BEAVERDAM RUN

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

Built 1939 Load: 45.4 t ADT: 220

SR 1007(LR 55053)

Good

Over: PA TURNPIKE(I-76) B-428

1.8 MI. N.W. OF ROXBURY, Somerset, PA

Built 2001 Load: 45.4 t ADT: 243

PA 523

Good

Over: CASSELMAN RIVER

HARNEDSVILLE, Somerset, PA

Built 2002 Load: 45.4 t ADT: 1,187

SR 2006

Good

Over: FLAUGHERTY CREEK

1.2 MILE EAST FROM US 219, Somerset, PA

Built 2009 Load: 45.4 t ADT: 1,381

SOUTH WOLF ROCK RD

Good

Over: TUB MILL RUN

FORBES STATE FOREST, Somerset, PA

Built 2014 Load: 45.7 t ADT: 25

MAIN ST (SR 1004)

Good

Over: RHOADS CREEK

SHANKSVILLE BORO, Somerset, PA

Built 2018 Load: 45.7 t ADT: 952

T-397

Good

Over: Shafer Run

1 Mi North of Bakersville, Somerset, PA

Built 2022 Load: 46.0 t ADT: 50

SR 2047

Good

Over: MILLER RUN

.5 MI.S.OF MEYERSDALE, Somerset, PA

Built 1998 Load: 46.3 t ADT: 4,886

SR 1029

Good

Over: SHADE CREEK

HILLSBORO, Somerset, PA

Built 2005 Load: 46.3 t ADT: 128

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.