County profile · official public datasets

Westmoreland County, PA

620 public highway bridges tracked in the FHWA National Bridge Inventory: 36.5% rated Good, 47.7% Fair, 15.8% Poor.

620
Public bridges: 36.5%
Good condition: 15.8%
Poor condition

The verdict

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

Westmoreland County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

52nd
of 67 on Poor share: 15.8%
Poor-condition share: 620
public highway bridges: 1975
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.

Westmoreland County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Westmoreland County ranks #52 of 67 Pennsylvania counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.8%). Westmoreland County, Pennsylvania contains 620 public highway bridges. Roughly 36.5% are rated “Good,” 47.7% “Fair,” and 15.8% “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

620

Public highway bridges in Westmoreland County

Good condition

36.5%

226 of 620 rated 7-9

Fair condition

47.7%

296 of 620 rated 5-6

Poor condition

15.8%

98 of 620 rated 4 or below

In-state Poor-share rank

#52 of 67

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

Condition distribution

Share of 620 NBI-tracked bridges by lowest applicable component rating.

Good

36.5% (226)

Fair

47.7% (296)

Poor

15.8% (98)

Westmoreland County's Poor-condition bridges carry 153,556 vehicle crossings a day

That is 3.8% of the county's reported daily bridge traffic on 15.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,616 crossings a day against 6,261 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 617 of 620 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

45.8% of Westmoreland County's bridges have passed the 50-year mark

284 of the 620 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 36.5% 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 8.6% of the county's Poor-condition bridge traffic

SR 0356 over PINE RUN, built 1927, carries 13,272 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 98-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 153,556 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1900s

13
1910s

12
1920s

27
1930s

58
1940s

20
1950s

78
1960s

46
1970s

60
1980s

50
1990s

91
2000s

66
2010s

87
2020s

11

What this shows Construction peaked in the 1990s, when 91 of the county's bridges still in the inventory were built, which is 14.7% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1975, 5 years newer than the Pennsylvania average of 1970.

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

The 5 Pennsylvania counties nearest Westmoreland County in number of bridges, with their condition splits. Its 15.8% Poor share is the 6th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1965 is 10 years newer.

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

Bridge inventory size and condition shares for Westmoreland County and the 5 Pennsylvania counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Chester County	680	25%	61.3%	13.7%	1963
Berks County	667	21.4%	63.6%	15%	1962
Washington County	655	38.3%	49.6%	12.1%	1971
Westmoreland County (this page)	620	36.5%	47.7%	15.8%	1975
Philadelphia County	585	22.7%	64.1%	13.2%	1956
York County	569	31.1%	55.9%	13%	1972

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 Westmoreland 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 Westmoreland County, both outside Pennsylvania so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside PA (620 bridges here).

Contra Costa County, CA · 618 bridges
Brazoria County, TX · 618 bridges
McLean County, IL · 624 bridges
Monroe County, NY · 615 bridges

Similar average build year

Nearest mean year-built outside PA (1975 here).

San Bernardino County, CA · avg 1975 · 1,422 bridges
Lane County, OR · avg 1975 · 1,010 bridges
Fulton County, GA · avg 1975 · 775 bridges

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

All 620 Good 226 Fair 296 Poor 98

Good-condition bridges (226)

Sort:

Westmoreland County Bridge Snapshot

Condition distribution

Westmoreland County's Poor-condition bridges carry 153,556 vehicle crossings a day

45.8% of Westmoreland County's bridges have passed the 50-year mark

One structure carries 8.6% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (226)

SR 1021

OLD WILL PENN HIGH

Laird Street

SR 4041

SR 2003

SR 0130

Alley No. 1

SR 1026

LOCUST STREET

SR 3077

T-541 GLENN FOX RD

SR 3016 Madison Rd

FINNIN ROAD

LINN RUN PARK RD

SR 3093

SR 0070

SR 0070

SR 4034

SR 0819

SR 0136

SR 0993

PA TPK (PA 66)

EDGECLIFF ROAD

T941 - Piper Road

T-898 Monastery D

MT PLEASANT RD

SR 4025

SR 0119 SB

MARKET ST EXT

SR 3003

SR 3037

SR 0366

GREENSBURG RD

Stevenson Blvd

Laurelville Rd

SR 4009

PA TPK (I-76)

SR 3023

SR 4033

SR 3030

SR 0711

SR 0119 NB

SR 8030

SR 3040 / TR 318

SR 1050

T-682

PA TPK (PA 66)

LASH RD TR 471

EAST PITTSBURGH ST

SR 3003

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