Total bridges
263
Public highway bridges in Armstrong County
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.
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
- 1900s 1
1900–1909
1 bridges
- 1910s 10
1910–1919
10 bridges
- 1920s 11
1920–1929
11 bridges
- 1930s
1930–1939
20 bridges
- 1940s 17
1940–1949
17 bridges
- 1950s
1950–1959
25 bridges
- 1960s
1960–1969
30 bridges
- 1970s
1970–1979
22 bridges
- 1980s 19
1980–1989
19 bridges
- 1990s
1990–1999
23 bridges
- 2000s
2000–2009
23 bridges
- 2010s
2010–2019
50 bridges
- 2020s 12
2020–2029
12 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.
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Cambria County | 284 | 35.9% | 56.7% | 7.4% | 1975 |
| Columbia County | 271 | 42.8% | 47.2% | 10% | 1965 |
| Lawrence County | 265 | 47.5% | 41.1% | 11.3% | 1978 |
| Armstrong County (this page) | 263 | 33.5% | 58.6% | 8% | 1976 |
| Wayne County | 259 | 27% | 41.7% | 31.3% | 1967 |
| Adams County | 254 | 36.2% | 57.1% | 6.7% | 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 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).
- Douglas County, CO · 263 bridges
- Bingham County, ID · 263 bridges
- Guthrie County, IA · 263 bridges
- Henry County, MO · 263 bridges
Similar average build year
Nearest mean year-built outside PA (1976 here).
- Marion County, IN · avg 1976 · 958 bridges
- Mohave County, AZ · avg 1976 · 641 bridges
- Comanche County, OK · avg 1976 · 593 bridges
- Prince George's County, MD · avg 1976 · 576 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (263)
SR2027
PoorOver: FAGLEY RUN
FAGLEY RUN NO.2, Armstrong, PA
Built 1939 Load: 28.1 t ADT: 265
SR0028
PoorOver: SCRUBGRASS CREEK
GOHEENVILLE NO.2, Armstrong, PA
Built 1928 Load: 29.9 t ADT: 6,931
SR2059
PoorOver: GUFFY RUN
HUNGRY HOLLOW NO.4, Armstrong, PA
Built 1938 Load: 30.8 t ADT: 93
SR2005
PoorOver: CHERRY RUN
EAST OF BRICK CHURCH, Armstrong, PA
Built 1938 Load: 32.7 t ADT: 294
T-689 PETERMAN HIL
PoorOver: MILLER RUN
PETERMAN HILL, Armstrong, PA
Built 1966 Load: 32.7 t ADT: 400
SR0156
PoorOver: LONG RUN
NORTH OF AVONMORE, Armstrong, PA
Built 1957 Load: 33.6 t ADT: 750
SR1028
PoorOver: N BR S FRK PINE CREEK
ECHO CHURCH, Armstrong, PA
Built 1925 Load: 34.5 t ADT: 145
SR4010
PoorOver: TRIB TO BUFFALO CREEK
WORTHINGTON NO.6, Armstrong, PA
Built 1925 Load: 34.5 t ADT: 730
SR0156
PoorOver: NORFOLK SOUTHERN RR
AVONMORE STATION, Armstrong, PA
Built 1949 Load: 36.3 t ADT: 750
SR3027
PoorOver: DOCK HOLLOW RUN
DOCK HOLLOW RUN NO.1, Armstrong, PA
Built 1955 Load: 36.3 t ADT: 38
SR0128
PoorOver: TRIB TO PINE RUN
KERR NO.2, Armstrong, PA
Built 1921 Load: 40.8 t ADT: 1,026
SR1036
PoorOver: COWANSHANNOCK CREEK
RAYBURN TWP-N KITTANNING, Armstrong, PA
Built 1962 Load: 46.3 t ADT: 977
SR4009
PoorOver: 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.
Related
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.