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

Fair-condition bridges (239)

SR 1031

Fair

Over: SHADE CREEK

3.75 MI.NE.OF BLOUGH, Somerset, PA

Built 1939 Load: 1.8 t ADT: 648

SALISBURY STREET

Fair

Over: FLAUGHERTY CREEK

MEYERSDALE BOROUGH, Somerset, PA

Built 1974 Load: 3.6 t ADT: 200

PA 160

Fair

Over: CLEAR SHADE CREEK

2.5 MI.N.OF CENTRAL CITY, Somerset, PA

Built 1978 Load: 5.4 t ADT: 3,302

T-713 COUNTY BR RD

Fair

Over: WILLS CREEK

3 MI.W.OF GLENCOE, Somerset, PA

Built 1925 Load: 5.4 t ADT: 50

T-495 GARY ROAD

Fair

Over: LAUREL HILL CREEK

2 MI.S.OF TRENT, Somerset, PA

Built 1971 Load: 7.3 t ADT: 50

T-625 BRNS.HILL RD

Fair

Over: BEAVER DAM CREEK

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

Built 1900 Load: 11.8 t ADT: 150

T325 ENGLES MILL R

Fair

Over: PINEY RUN

1.1 MI.E.OF SALISBURY, Somerset, PA

Built 1915 Load: 12.7 t ADT: 20

T798 NUMBER 1 ROAD

Fair

Over: LAUREL RUN

.2 MI.N.OF CENTRAL CITY, Somerset, PA

Built 1917 Load: 13.6 t ADT: 70

T611 DUNMYER ROAD

Fair

Over: BEAVER DAM CREEK

1.5 MI.SW.OF STOYSTOWN, Somerset, PA

Built 1964 Load: 15.4 t ADT: 60

LAKE LOOP ROAD

Fair

Over: KOOSER RUN

500 FT SE OF SR 31, Somerset, PA

Built 1933 Load: 17.2 t ADT: 140

PA 160

Fair

Over: SEESE RUN

WINDBER, Somerset, PA

Built 1962 Load: 18.1 t ADT: 3,460

SR 2014

Fair

Over: CASSELMAN RIVER

BOYNTON, Somerset, PA

Built 1962 Load: 18.1 t ADT: 386

T-756 PASO FINO RD

Fair

Over: LAUREL RUN

4 MI.SW.OF GLENCOE, Somerset, PA

Built 1927 Load: 18.1 t ADT: 51

SR 4031

Fair

Over: SOUTH FORK BENS CREEK

THOMAS MILLS, Somerset, PA

Built 1962 Load: 19.1 t ADT: 893

T548 BRKHOLD BR RD

Fair

Over: BUFFALO CREEK

2 MI.NE.OF GARRETT, Somerset, PA

Built 1890 Load: 19.1 t ADT: 50

T519 WALTERSMILL R

Fair

Over: EAST BRANCH COXES CREEK

3 MI.S.OF SOMERSET, Somerset, PA

Built 1961 Load: 19.1 t ADT: 75

PA 56

Fair

Over: CLEAR SHADE CREEK

OGLETOWN, Somerset, PA

Built 1929 Load: 22.7 t ADT: 3,772

PA 403

Fair

Over: KAUFMAN RUN

TIRE HILL, Somerset, PA

Built 1929 Load: 22.7 t ADT: 4,135

SR 3006

Fair

Over: MIDDLE CREEK

4 MI.SW.OF ROCKWOOD, Somerset, PA

Built 1962 Load: 22.7 t ADT: 113

T813 TOWN HILL RD

Fair

Over: RAYSTOWN BR.JUNIATA RIV.

NEW BALTIMORE BORO., Somerset, PA

Built 1998 Load: 22.7 t ADT: 50

T-338 FALL RUN RD

Fair

Over: FALL CREEK

1.5 MI.NW.OF BARRONVALE, Somerset, PA

Built 1930 Load: 22.7 t ADT: 50

T-568 BOONE ROAD

Fair

Over: BOONE RUN

3.5 MI.W.OF SHANKSVILLE, Somerset, PA

Built 1930 Load: 22.7 t ADT: 25

T769 E. CAMPUS AVE

Fair

Over: US 219

0.4 MILE NORTH OF TR 403, Somerset, PA

Built 1969 Load: 23.6 t ADT: 582

T310 CAMP GROUND R

Fair

Over: WHITES CREEK

1 MI.S.OF HARNEDSVILLE, Somerset, PA

Built 1970 Load: 24.5 t ADT: 50

T-800 Abex Road

Fair

Over: Quemahoning Creek

1.0 mi South of Benson, Somerset, PA

Built 1960 Load: 24.5 t ADT: 200

PA 31

Fair

Over: W.BR.COXES CREEK

170 FEET WEST OF SR 4005, Somerset, PA

Built 1963 Load: 25.4 t ADT: 5,636

US 219

Fair

Over: CSX RR & STONYCREEK RIV

SOMERSET/CAMBRIA CO LINE, Somerset, PA

Built 1970 Load: 25.4 t ADT: 15,003

SR 4022

Fair

Over: US 219

2 MI.SE.OF TIRE HILL, Somerset, PA

Built 1969 Load: 25.4 t ADT: 312

T312 COVERED BR RD

Fair

Over: LAUREL HILL CREEK

1.3 MI.NE.OF URSINA, Somerset, PA

Built 1891 Load: 25.4 t ADT: 50

US 219 SBL

Fair

Over: PA 403

OVER PA 403, Somerset, PA

Built 1969 Load: 26.3 t ADT: 7,564

T864 RIVER ROAD

Fair

Over: CASSELMAN RIVER

VILLAGE OF WORTH, Somerset, PA

Built 1963 Load: 26.3 t ADT: 129

SR 3031

Fair

Over: MIDDLE CREEK

KIMMEL, Somerset, PA

Built 1962 Load: 26.3 t ADT: 407

US 219 NBL

Fair

Over: PA 601

OVER PA 601, Somerset, PA

Built 1969 Load: 27.2 t ADT: 5,776

US 219 SBL

Fair

Over: PA 601

OVER PA 601, Somerset, PA

Built 1969 Load: 27.2 t ADT: 5,704

SR 2017

Fair

Over: WHEELER RUN

MANCE, Somerset, PA

Built 1937 Load: 27.2 t ADT: 61

T811 SUHRIE HOL RD

Fair

Over: RAYSTOWN BR.JUNIATA RIV.

3.5 MI.SW.NEW BALTIMORE, Somerset, PA

Built 1973 Load: 27.2 t ADT: 25

US 219 SBL

Fair

Over: CSX RAILROAD

0.2 MILE NORTH OF TR 281, Somerset, PA

Built 1973 Load: 28.1 t ADT: 5,793

US 219 NBL

Fair

Over: US 30

OVER US 30, Somerset, PA

Built 1968 Load: 28.1 t ADT: 6,196

US 219 SBL

Fair

Over: US 30

OVER US 30, Somerset, PA

Built 1968 Load: 28.1 t ADT: 6,193

US 219 NBL

Fair

Over: SR 4016

OVER SR 4016, Somerset, PA

Built 1969 Load: 28.1 t ADT: 5,776

US 219 SBL

Fair

Over: SR 4016

OVER SR 4016, Somerset, PA

Built 1969 Load: 28.1 t ADT: 5,704

PA 403

Fair

Over: STONYCREEK RIVER

KANTNER, Somerset, PA

Built 1971 Load: 28.1 t ADT: 1,033

SR 2017

Fair

Over: PANTHER RUN

1 MI.NW.OF JOHNSBURG, Somerset, PA

Built 1938 Load: 28.1 t ADT: 51

T718 MILLER RUN RD

Fair

Over: MILLER RUN

1 MI.S.OF SANDPATCH, Somerset, PA

Built 1963 Load: 28.1 t ADT: 33

SR 4023

Fair

Over: QUEMAHONING CREEK

1.6 M.S.JENNER CROSSROADS, Somerset, PA

Built 1971 Load: 28.1 t ADT: 1,721

CAMP LOOP #1

Fair

Over: LAUREL HILL CREEK TRIB

1/2 MI NW OF SR 3029, Somerset, PA

Built 1973 Load: 28.1 t ADT: 50

US 219 NBL

Fair

Over: CSX RAILROAD

0.2 MILE NORTH OF TR 281, Somerset, PA

Built 1973 Load: 29.0 t ADT: 5,453

SR 2037

Fair

Over: BIGBY RUN

2 MI.SW.OF GARRETT, Somerset, PA

Built 1964 Load: 29.0 t ADT: 557

SR 4023

Fair

Over: QUEMAHONING CREEK

.6 M.S.JENNERS CROSSROADS, Somerset, PA

Built 1971 Load: 29.0 t ADT: 1,721

US 219 NBL

Fair

Over: T741 PILLTOWN ROAD

2.57 MILE NORTH OF US 30, Somerset, PA

Built 1969 Load: 29.9 t ADT: 6,196

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.