Total bridges
163
Public highway bridges in Union County
County profile · official public datasets
Union County, PA
163 public highway bridges tracked in the FHWA National Bridge Inventory: 50.9% rated Good, 44.8% Fair, 4.3% Poor.
- 163
- Public bridges
- 50.9%
- Good condition
- 4.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Union County posts a top-10% lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 6%
- lowest Poor share in state
- 4.3%
- Poor-condition share
- 163
- 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.
Union County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Union County ranks #4 of 67 Pennsylvania counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.3%). Union County, Pennsylvania contains 163 public highway bridges. Roughly 50.9% are rated “Good,” 44.8% “Fair,” and 4.3% “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.
Good condition
50.9%
83 of 163 rated 7-9
Fair condition
44.8%
73 of 163 rated 5-6
Poor condition
4.3%
7 of 163 rated 4 or below
In-state Poor-share rank
#4 of 67
Among Pennsylvania counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 163 NBI-tracked bridges by lowest applicable component rating.
Good 50.9% (83)
Fair 44.8% (73)
Poor 4.3% (7)
Union County's Poor-condition bridges carry 2,153 vehicle crossings a day
That is 0.4% of the county's reported daily bridge traffic on 4.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 308 crossings a day against 2,864 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 163 of 163 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
58.9% of Union County's bridges have passed the 50-year mark
96 of the 163 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 50.9% 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 58.9% of the county's Poor-condition bridge traffic
SR 3012 over OVER SWEITZERS RUN, built 1948, carries 1,269 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 7-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 2,153 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Union County's bridges were built
163 bridges with a recorded construction year, grouped by decade
- pre-1900 2
Built before 1900
2 bridges
- 1900s 7
1900–1909
7 bridges
- 1910s 3
1910–1919
3 bridges
- 1920s 2
1920–1929
2 bridges
- 1930s
1930–1939
24 bridges
- 1940s
1940–1949
10 bridges
- 1950s
1950–1959
10 bridges
- 1960s
1960–1969
20 bridges
- 1970s
1970–1979
24 bridges
- 1980s
1980–1989
10 bridges
- 1990s
1990–1999
10 bridges
- 2000s
2000–2009
11 bridges
- 2010s
2010–2019
25 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 2010s, when 25 of the county's bridges still in the inventory were built, which is 15.3% 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).
How Union County compares with Pennsylvania's closest counties by inventory size
The 5 Pennsylvania counties nearest Union County in number of bridges, with their condition splits. Its 4.3% Poor share is the 1st-lowest of these 6. Its average build year of 1969 against a peer-group mean of 1969 is in line with the group.
Showing the 5 closest of 66 Pennsylvania counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Clarion County | 172 | 27.9% | 64% | 8.1% | 1974 |
| Juniata County | 169 | 30.2% | 56.2% | 13.6% | 1969 |
| Union County (this page) | 163 | 50.9% | 44.8% | 4.3% | 1969 |
| Snyder County | 161 | 47.2% | 47.2% | 5.6% | 1966 |
| Fulton County | 159 | 32.1% | 56% | 11.9% | 1967 |
| Pike County | 158 | 35.4% | 38.6% | 25.9% | 1971 |
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 Union 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 Union County, both outside Pennsylvania so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside PA (163 bridges here).
- Mercer County, IL · 163 bridges
- Jennings County, IN · 163 bridges
- Wayne County, IA · 163 bridges
- Jackson County, LA · 163 bridges
Similar average build year
Nearest mean year-built outside PA (1969 here).
- Cook County, IL · avg 1969 · 1,721 bridges
- Fresno County, CA · avg 1969 · 916 bridges
- Cuyahoga County, OH · avg 1969 · 871 bridges
- Ventura County, CA · avg 1969 · 501 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (163)
I-80 WB
GoodOver: OVER DIETRICK RD T-519
4 MI SW OF WHITE DEER, Union, PA
Built 1970 Load: 57.2 t ADT: 10,065
HOOFNAGLE ROAD
GoodOver: WEIKERT RUN
WEIKERT RUN RD INTERSECT, Union, PA
Built 1997 Load: 57.2 t ADT: 30
SR 2007
GoodOver: OVER BUFFALO CREEK
0.2 MI NW OF LEWISBURG, Union, PA
Built 1962 Load: 61.7 t ADT: 5,993
SR 192
GoodOver: OVER RAPID RUN
R B WINTER STATE PARK, Union, PA
Built 1939 Load: 65.3 t ADT: 870
SR 2007
GoodOver: OVER TURTLE CREEK
2 MILES SW OF LINNTOWN, Union, PA
Built 2000 Load: 68.9 t ADT: 270
SR 0015 (TR-15)
GoodOver: OVER TRIB WB SUSQ RIVER
VILLAGE OF NEW COLUMBIA, Union, PA
Built 1964 Load: 99.8 t ADT: 14,362
T-319 RED BRIDGE
PoorOver: PENNS CREEK
0.9 MI SW OF MILLMONT, Union, PA
Built 1855 Load: 0.0 t ADT: 10
T-357
PoorOver: N. BR. BUFFALO CREEK
EAST OF JOHNSTOWN, Union, PA
Built 1900 Load: 0.0 t ADT: 119
T-376 CTY BR. 20
PoorOver: BUFFALO CREEK
2.3 MI. W OF MIFFLINBURG, Union, PA
Built 1900 Load: 5.4 t ADT: 150
T-421 (CTY. BR. 2)
PoorOver: WHITE DEER HOLE CREEK
0.25 MI.S OF ALLENWOOD, Union, PA
Built 1889 Load: 10.9 t ADT: 13
T-428 (CTY BR 6)
PoorOver: SPRUCE RUN
2.7 MILES N. OF MAZEPPA, Union, PA
Built 1925 Load: 13.6 t ADT: 54
SR 3012
PoorOver: OVER SWEITZERS RUN
1 MI W OF NEW BERLIN, Union, PA
Built 1948 Load: 27.2 t ADT: 1,269
SR 2001
PoorOver: BUFFALO CREEK
1 MI W BUFFALO CROSSROADS, Union, PA
Built 1960 Load: 44.5 t ADT: 538
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.