County profile · official public datasets

Armstrong County, PA

263 public highway bridges tracked in the FHWA National Bridge Inventory: 33.5% rated Good, 58.6% Fair, 8% Poor.

263
Public bridges
33.5%
Good condition
8%
Poor condition

The verdict

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

Armstrong County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 19%
lowest Poor share in state
8%
Poor-condition share
263
public highway bridges
1976
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.

Armstrong County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Armstrong County ranks #13 of 67 Pennsylvania counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8%). Armstrong County, Pennsylvania contains 263 public highway bridges. Roughly 33.5% are rated “Good,” 58.6% “Fair,” and 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

263

Public highway bridges in Armstrong County

Good condition

33.5%

88 of 263 rated 7-9

Fair condition

58.6%

154 of 263 rated 5-6

Poor condition

8%

21 of 263 rated 4 or below

In-state Poor-share rank

#13 of 67

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

Condition distribution

Share of 263 NBI-tracked bridges by lowest applicable component rating.

Good
33.5% (88)
Fair
58.6% (154)
Poor
8% (21)

Armstrong County's Poor-condition bridges carry 14,649 vehicle crossings a day

That is 2.1% of the county's reported daily bridge traffic on 8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 698 crossings a day against 1,682 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 263 of 263 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

49.8% of Armstrong County's bridges have passed the 50-year mark

131 of the 263 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 33.5% 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 47.3% of the county's Poor-condition bridge traffic

SR0028 over SCRUBGRASS CREEK, built 1928, carries 6,931 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 21-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 14,649 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Armstrong County's bridges were built

263 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 50 of the county's bridges still in the inventory were built, which is 19% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1976, 6 years newer than the Pennsylvania average of 1970.

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

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

The 5 Pennsylvania counties nearest Armstrong County in number of bridges, with their condition splits. Its 8% Poor share is the 3rd-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1971 is 5 years newer.

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

Bridge inventory size and condition shares for Armstrong County and the 5 Pennsylvania counties closest to it in inventory size
County Bridges Poor
Cambria County 284 7.4%
Columbia County 271 10%
Lawrence County 265 11.3%
Armstrong County (this page) 263 8%
Wayne County 259 31.3%
Adams County 254 6.7%

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

Similar inventory size

Nearest county inventories outside PA (263 bridges here).

Similar average build year

Nearest mean year-built outside PA (1976 here).

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

All 263 Good 88 Fair 154 Poor 21

Poor-condition bridges (21)

T-487 BRIDGE ROAD

Poor

Over: COWANSHANNOCK CREEK

500 FEET S OF OF SR-839, Armstrong, PA

Built 1930 Load: 4.5 t ADT: 21

T-501 BOLTZ ROAD

Poor

Over: BUFFALO & PITT RR

1/2 miles west of SR-0268, Armstrong, PA

Built 1900 Load: 4.5 t ADT: 250

T-466 ST.CHARLES

Poor

Over: REDBANK CREEK

1.8 mile north of sr-1004, Armstrong, PA

Built 1958 Load: 12.7 t ADT: 125

T-881 CLINTON ROAD

Poor

Over: BUFFALO & PITTSBURG RR

1.5 miles s. of SR-3128, Armstrong, PA

Built 1910 Load: 13.6 t ADT: 45

T-860 BEAGLE CLUB

Poor

Over: HULING RUN

1/4 mile north of T-419, Armstrong, PA

Built 1952 Load: 20.0 t ADT: 120

SR2005

Poor

Over: CHERRY RUN

EAST OF BRICK CHURCH, Armstrong, PA

Built 1950 Load: 23.6 t ADT: 239

SR2008

Poor

Over: MILL RUN

MCNEES, Armstrong, PA

Built 1941 Load: 24.5 t ADT: 173

T-850 HOUSER ROAD

Poor

Over: SCRUBGRASS CREEK

525ft W of SR28/66, Armstrong, PA

Built 1980 Load: 25.4 t ADT: 400

SR2027

Poor

Over: FAGLEY RUN

FAGLEY RUN NO.2, Armstrong, PA

Built 1939 Load: 28.1 t ADT: 265

SR0028

Poor

Over: SCRUBGRASS CREEK

GOHEENVILLE NO.2, Armstrong, PA

Built 1928 Load: 29.9 t ADT: 6,931

SR2059

Poor

Over: GUFFY RUN

HUNGRY HOLLOW NO.4, Armstrong, PA

Built 1938 Load: 30.8 t ADT: 93

SR2005

Poor

Over: CHERRY RUN

EAST OF BRICK CHURCH, Armstrong, PA

Built 1938 Load: 32.7 t ADT: 294

T-689 PETERMAN HIL

Poor

Over: MILLER RUN

PETERMAN HILL, Armstrong, PA

Built 1966 Load: 32.7 t ADT: 400

SR0156

Poor

Over: LONG RUN

NORTH OF AVONMORE, Armstrong, PA

Built 1957 Load: 33.6 t ADT: 750

SR1028

Poor

Over: N BR S FRK PINE CREEK

ECHO CHURCH, Armstrong, PA

Built 1925 Load: 34.5 t ADT: 145

SR4010

Poor

Over: TRIB TO BUFFALO CREEK

WORTHINGTON NO.6, Armstrong, PA

Built 1925 Load: 34.5 t ADT: 730

SR0156

Poor

Over: NORFOLK SOUTHERN RR

AVONMORE STATION, Armstrong, PA

Built 1949 Load: 36.3 t ADT: 750

SR3027

Poor

Over: DOCK HOLLOW RUN

DOCK HOLLOW RUN NO.1, Armstrong, PA

Built 1955 Load: 36.3 t ADT: 38

SR0128

Poor

Over: TRIB TO PINE RUN

KERR NO.2, Armstrong, PA

Built 1921 Load: 40.8 t ADT: 1,026

SR1036

Poor

Over: COWANSHANNOCK CREEK

RAYBURN TWP-N KITTANNING, Armstrong, PA

Built 1962 Load: 46.3 t ADT: 977

SR4009

Poor

Over: HART RUN

BRADYS BEND NO.12, Armstrong, PA

Built 1953 Load: 48.1 t ADT: 877

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

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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.