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)

US 219 SBL

Fair

Over: T741 PILLTOWN ROAD

2.57 MILE NORTH OF US 30, Somerset, PA

Built 1969 Load: 29.9 t ADT: 6,193

PA 403

Fair

Over: OVEN RUN

ROWENA, Somerset, PA

Built 1932 Load: 29.9 t ADT: 941

PA 403

Fair

Over: CSX RR STONYCREEK RIVER

LANDSTREET, Somerset, PA

Built 1983 Load: 29.9 t ADT: 998

PA TPK (I-76)

Fair

Over: SR 2033(LR 55046)

WEST OF ALLEGHENY TUNNEL, Somerset, PA

Built 2004 Load: 29.9 t ADT: 29,452

T-676 GLESSNER RD

Fair

Over: BENS CREEK

BENS CREEK, Somerset, PA

Built 1957 Load: 29.9 t ADT: 100

MAIN PARK ROAD

Fair

Over: LAUREL HILL CREEK

3/4 MI WEST OF SR 3037, Somerset, PA

Built 1934 Load: 29.9 t ADT: 190

MAIN PARK ROAD

Fair

Over: JONES MILL RUN

1 MI NORTH OF SR 3029, Somerset, PA

Built 2003 Load: 29.9 t ADT: 230

US 219 NBL

Fair

Over: QUEMAHONING CREEK

2 MILE NORTH OF US 30, Somerset, PA

Built 1969 Load: 30.8 t ADT: 6,196

SR 4009

Fair

Over: QUEMAHONING CREEK

1 MI.S.OF EDIE, Somerset, PA

Built 1968 Load: 30.8 t ADT: 459

US 219 NBL

Fair

Over: SR 4039

OVER SR4039 E DAVIDSVILLE, Somerset, PA

Built 1969 Load: 31.8 t ADT: 7,439

US 219 SBL

Fair

Over: SR 4039

OVER SR 4039, Somerset, PA

Built 1969 Load: 31.8 t ADT: 7,564

SR 4019

Fair

Over: QUEMAHONING CREEK

1.8 MI.E.OF JEROME, Somerset, PA

Built 1926 Load: 31.8 t ADT: 633

T626 CRITCHFIELD R

Fair

Over: US 219

3.6 MILE NORTH OF TR 281, Somerset, PA

Built 1969 Load: 32.7 t ADT: 37

US 219 SBL

Fair

Over: SR 4010

OVER SR 4010, Somerset, PA

Built 1969 Load: 32.7 t ADT: 6,193

US 219 NBL

Fair

Over: SR 4035

OVER SR 4035, Somerset, PA

Built 1969 Load: 32.7 t ADT: 6,196

SR 2019

Fair

Over: WILLS CREEK

FAIRHOPE, Somerset, PA

Built 1961 Load: 32.7 t ADT: 136

SR 4004

Fair

Over: US 219

.25 MI.N.OF GIDEON, Somerset, PA

Built 1969 Load: 32.7 t ADT: 322

SR 4015

Fair

Over: TR.QUEMAHONING CREEK

1 MI.S.OF EDIE, Somerset, PA

Built 1987 Load: 32.7 t ADT: 174

PA TPK (I-76)

Fair

Over: TRIB. TO STONEY CREEK

WEST OF ALLEGHENY TUNNEL, Somerset, PA

Built 1939 Load: 32.7 t ADT: 29,452

PA TPK (I-76)

Fair

Over: THREE LICK RUN

NEAR NEW BALTIMORE, Somerset, PA

Built 1939 Load: 32.7 t ADT: 31,200

T-679 BELLTOWN RD

Fair

Over: N.BR.QUEMAHONING CREEK

2.5 MI.NW.OF SIPESVILLE, Somerset, PA

Built 1940 Load: 32.7 t ADT: 20

T648 READING MINE

Fair

Over: BEAVER DAM CREEK

1 MI.SW.OF STOYSTOWN, Somerset, PA

Built 1910 Load: 32.7 t ADT: 50

T624 HILLTOP ROAD

Fair

Over: WELLS CREEK

FRIEDENS HILLTOP ROAD, Somerset, PA

Built 1928 Load: 32.7 t ADT: 103

T-357 KENNELS MILL

Fair

Over: GLADDENS RUN

4 MI.N.OF WELLERSBURG, Somerset, PA

Built 1912 Load: 32.7 t ADT: 150

CLARK STREET

Fair

Over: DIXIE RUN

HOOVERSVILLE BOROUGH, Somerset, PA

Built 1976 Load: 32.7 t ADT: 150

NORTH SHORE TRAIL

Fair

Over: CALENDARS RUN

INDIAN LAKE BOROUGH, Somerset, PA

Built 1997 Load: 32.7 t ADT: 20

T616 Buffalo Crk R

Fair

Over: Buffalo Creek

2.5Mi SW of Berlin, Somerset, PA

Built 1990 Load: 32.7 t ADT: 50

US 219 NBL

Fair

Over: SR 4010

OVER SR 4010, Somerset, PA

Built 1969 Load: 33.6 t ADT: 6,196

PA 281

Fair

Over: WEST BR COXES CREEK

1 MI.S.OF SOMERSET, Somerset, PA

Built 1997 Load: 33.6 t ADT: 4,070

PA 403

Fair

Over: BENS CREEK

BENS CREEK, Somerset, PA

Built 1953 Load: 33.6 t ADT: 4,899

PA 601

Fair

Over: TR.QUEMAHONING CREEK

0.5 MILE NORTH OF US 219, Somerset, PA

Built 1969 Load: 33.6 t ADT: 857

PA 653

Fair

Over: LAUREL HILL CREEK

1.8 MI.W.NEW LEXINGTON, Somerset, PA

Built 1934 Load: 33.6 t ADT: 961

T864 WHITE CREEK R

Fair

Over: WHITES CREEK

3 MILE E.OF LISTONBURG, Somerset, PA

Built 1942 Load: 33.6 t ADT: 73

SR 4041

Fair

Over: STONYCREEK RIVER

KRINGS, Somerset, PA

Built 1937 Load: 33.6 t ADT: 1,951

SR 2047

Fair

Over: MILLER RUN

1.5 MI.N.OF BERLIN, Somerset, PA

Built 1951 Load: 34.5 t ADT: 3,897

US 219 NBL

Fair

Over: PENNSYLVANIA TURNPIKE

OVER PA TURNPIKE, Somerset, PA

Built 1973 Load: 34.5 t ADT: 2,837

US 219 SBL

Fair

Over: PENNSYLVANIA TURNPIKE

OVER PA TURNPIKE, Somerset, PA

Built 1973 Load: 34.5 t ADT: 3,384

PA 985

Fair

Over: TR QUEMAHONING CREEK

GRAY, Somerset, PA

Built 1953 Load: 34.5 t ADT: 2,931

PA 985

Fair

Over: BEAVER DAM RUN

2 MI.S.OF JENNERSTOWN, Somerset, PA

Built 1953 Load: 34.5 t ADT: 2,612

PA 985

Fair

Over: DALTON RUN

1 MI.N.OF SULRHUR SPRING, Somerset, PA

Built 1954 Load: 34.5 t ADT: 2,895

SR 2004

Fair

Over: ELK LICK CREEK

SUMMIT MILLS, Somerset, PA

Built 1990 Load: 34.5 t ADT: 594

T718 MILLER RUN RD

Fair

Over: MILLER RUN

1.5 MI.S.OF SAND PATCH, Somerset, PA

Built 1963 Load: 34.5 t ADT: 33

PA 31 (LR 49)

Fair

Over: PTC B-481 MP 114.55

NEAR SR 31 & SR 1001 JCT, Somerset, PA

Built 2001 Load: 34.5 t ADT: 3,931

WINDBER 17TH ST.

Fair

Over: PA 56 & SEESE RUN

WINDBER BORO., Somerset, PA

Built 1959 Load: 35.4 t ADT: 442

SR 2047

Fair

Over: TRIB MILLER RUN

1.5 MI.N.OF BERLIN, Somerset, PA

Built 1951 Load: 35.4 t ADT: 3,897

US 219 SBL

Fair

Over: SR 4035

OVER SR 4035, Somerset, PA

Built 1969 Load: 35.4 t ADT: 6,193

PA 601

Fair

Over: STONY CREEK RIVER

1 MI.E.OF BENSON, Somerset, PA

Built 1984 Load: 35.4 t ADT: 621

SR 1018

Fair

Over: DARK SHADE CREEK

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

Built 1962 Load: 35.4 t ADT: 427

SR 2013

Fair

Over: GLADDENS RUN

GLADDENS, Somerset, PA

Built 1942 Load: 35.4 t ADT: 263

SR 2019

Fair

Over: WILLS CREEK

2 MI.SE.OF FAIRHOPE, Somerset, PA

Built 1985 Load: 35.4 t ADT: 136

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.