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.

Total bridges

163

Public highway bridges in Union County

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

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).

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

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.

Bridge inventory size and condition shares for Union County and the 5 Pennsylvania counties closest to it in inventory size
County Bridges Poor
Clarion County 172 8.1%
Juniata County 169 13.6%
Union County (this page) 163 4.3%
Snyder County 161 5.6%
Fulton County 159 11.9%
Pike County 158 25.9%

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).

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 163 Good 83 Fair 73 Poor 7

All bridges (163)

HASSENPLUG BR.

Fair

Over: BUFFALO CREEK

N 4th STREET MIFFLINBURG, Union, PA

Built 1900 Load: 11.8 t ADT: 300

T-707

Fair

Over: LAUREL RUN

0.75 MI NNW OF GLEN IRON, Union, PA

Built 1900 Load: 12.7 t ADT: 50

T-380

Fair

Over: BUFFALO CREEK

1.2 Mi NNE OF MIFFLINBURG, Union, PA

Built 1970 Load: 20.9 t ADT: 162

SR 3020

Fair

Over: OVER LAUREL RUN

1 MI N OF LAURELTON, Union, PA

Built 1959 Load: 22.7 t ADT: 879

T-432

Fair

Over: TURTLE CREEK

1.7 MI SOUTH OF LINNTOWN, Union, PA

Built 1932 Load: 23.6 t ADT: 500

US TR 15

Fair

Over: OVER WINFIELD CREEK

VILLAGE OF WINFIELD, Union, PA

Built 1930 Load: 24.5 t ADT: 16,071

SR 15 NBL

Fair

Over: T-519 TRIB SUSQ RVR

2 MI N OF NEW COLUMBIA, Union, PA

Built 1963 Load: 24.5 t ADT: 7,460

US 15 SB

Fair

Over: T-519 TRIB SUSQ RVR

2 MI N OF NEW COLUMBIA, Union, PA

Built 1963 Load: 24.5 t ADT: 8,708

T-389 CTY BR # 07

Fair

Over: BLACK RUN

0.8 MI. NW OF MAZEPPA, Union, PA

Built 1936 Load: 24.5 t ADT: 228

T-522 (CTY BR # 3)

Fair

Over: WHITE DEER CREEK

0.2 MI. NE OF WHITE DEER, Union, PA

Built 1974 Load: 24.5 t ADT: 60

SR 1002

Fair

Over: BLACK RUN

VILLAGE OF MAZEPPA, Union, PA

Built 1948 Load: 25.4 t ADT: 2,284

BROWN & S 3RD STS.

Fair

Over: LIMESTONE RUN

BROWN & S. 3RD ST LWBG, Union, PA

Built 1986 Load: 26.3 t ADT: 1,994

T-514 CTY BR # 9

Fair

Over: WHITE DEER CREEK

1.5 MI. W. OF WHITE DEER, Union, PA

Built 1915 Load: 26.9 t ADT: 163

SR 3006

Fair

Over: OVER COLD RUN

1 MI S.OF HARTLETON, Union, PA

Built 1945 Load: 27.2 t ADT: 111

SR 45 (TR-45)

Fair

Over: OVER BULL RUN

VILLAGE OF LINNTOWN, Union, PA

Built 1938 Load: 29.0 t ADT: 11,926

SR 1003

Fair

Over: LITTLE BUFFALO CREEK

1 MI WEST OF KELLY POINT, Union, PA

Built 1985 Load: 29.0 t ADT: 431

SR 45

Fair

Over: OVER TRIB. BUFFALO CR.

1 MI E OF MIFFLINBURG, Union, PA

Built 1938 Load: 30.8 t ADT: 11,735

SR 1002

Fair

Over: OVER LITTLE BUFFALO CRK.

2 MI S OF KELLY CROSSROAD, Union, PA

Built 1949 Load: 30.8 t ADT: 2,233

SR 15

Fair

Over: OVER SR 1004

WEST MILTON, Union, PA

Built 1964 Load: 31.8 t ADT: 14,362

SR 0045

Fair

Over: OVER BULL RUN

1 MI W OF LEWISBURG, Union, PA

Built 1937 Load: 31.8 t ADT: 11,961

SR 1003

Fair

Over: OVER LITTLE BUFFALO CRK.

1.5 MI N KELLY CROSSROADS, Union, PA

Built 1936 Load: 31.8 t ADT: 431

SPRUCE RUN ROAD

Fair

Over: SPRUCE RUN

0.5 MI SW RUNNING GAP RD, Union, PA

Built 1935 Load: 31.8 t ADT: 15

SR 44

Fair

Over: OVER SOUTH CREEK

1 MI N W OF ALLENWOOD, Union, PA

Built 1954 Load: 32.7 t ADT: 1,301

SR 45

Fair

Over: BEAVER RUN

VILLAGE OF VICKSBURG, Union, PA

Built 1940 Load: 32.7 t ADT: 11,598

SR 45

Fair

Over: OVER BR OF LIMESTONE RUN

2.5 MI EAST OF VICKSBURG, Union, PA

Built 1936 Load: 32.7 t ADT: 11,598

SR 0192

Fair

Over: TRIB.TO RAPID RUN

1 MI NW OF COWAN, Union, PA

Built 1930 Load: 32.7 t ADT: 1,195

SR 1002

Fair

Over: OVER RAPID RUN

3 MI W OF MAZEPPA, Union, PA

Built 1965 Load: 32.7 t ADT: 1,850

SR 1003

Fair

Over: TRIB TO LITTLE BUFFALO C

1.5 MI S KELLY CROSSROAD, Union, PA

Built 1976 Load: 32.7 t ADT: 431

SR 1011

Fair

Over: TRIB.TO SUSQUEHANNA RIVE

VILLAGE OF NEW COLUMBIA, Union, PA

Built 1932 Load: 32.7 t ADT: 3,154

FURNACE ROAD

Fair

Over: TRIB TO TURTLE CREEK

5 MI SW OF LEWISBURG, Union, PA

Built 1951 Load: 32.7 t ADT: 1,082

SR 2007

Fair

Over: LIMESTONE RUN

.5 MI.W.OF LEWISBURG, Union, PA

Built 1975 Load: 32.7 t ADT: 5,632

SR 3005

Fair

Over: OVER BUFFALO CREEK

2.5 MI NE OF HARTLETON, Union, PA

Built 1961 Load: 32.7 t ADT: 338

BULL RUN CROSSING

Fair

Over: LIMESTONE RUN

0.9 MI W OF LINNTOWN, Union, PA

Built 1900 Load: 32.7 t ADT: 864

STATE GAMELAND RD

Fair

Over: SPRING CREEK

3.2 MI. W. OF ALLENWOOD, Union, PA

Built 1919 Load: 32.7 t ADT: 5

T-340 (CTY BR 11)

Fair

Over: SWEITZERS RUN

0.9 MI. SE OF DICE, Union, PA

Built 1900 Load: 32.7 t ADT: 54

T-400 CTY BR 18

Fair

Over: RAPID RUN

0.3 MI. N. OF FOREST HILL, Union, PA

Built 1916 Load: 32.7 t ADT: 50

UNIVERSITY AVE

Fair

Over: LIMESTONE RUN

UNIVERSITY AVE. LEWISBURG, Union, PA

Built 1900 Load: 32.7 t ADT: 1,944

T-338

Fair

Over: TURKEY RUN

1.0 MI. NE OF DICE, Union, PA

Built 1980 Load: 32.7 t ADT: 25

SR 15 NBL

Fair

Over: OVER SR 1008

VILLAGE OF NEW COLUMBIA, Union, PA

Built 1964 Load: 33.6 t ADT: 7,133

SR 1013

Fair

Over: OVER I-80 WB

2 MI W OF WHITE DEER, Union, PA

Built 1970 Load: 33.6 t ADT: 378

SR 192 (TR-192)

Fair

Over: TRIB.TO BUFFALO CREEK

1 MI W OF BUFFALO CROSSRD, Union, PA

Built 1955 Load: 33.6 t ADT: 2,275

SR 1004

Fair

Over: LITTLE BUFFALO CREEK

VILLAGE OF KELLY CROSSRDS, Union, PA

Built 1950 Load: 34.5 t ADT: 1,553

SR 3003=8TH STREET

Fair

Over: BUFFALO CREEK

BORO OF MIFFLINBURG, Union, PA

Built 1940 Load: 34.5 t ADT: 1,362

SR 0015 SBL

Fair

Over: OVER TURTLE CREEK

1.5 MI N OF WINFIELD, Union, PA

Built 1930 Load: 35.4 t ADT: 7,868

SR 15 SBL

Fair

Over: OVER SR 1008

VILLAGE OF NEW COLUMBIA, Union, PA

Built 1964 Load: 35.4 t ADT: 7,229

I-80 WB

Fair

Over: OVER SR 4001

7 MI W OF WHITE DEER, Union, PA

Built 1970 Load: 35.4 t ADT: 10,065

SR 1002

Fair

Over: OVER SPRUCE RUN

1 MI E OF MAZEPPA, Union, PA

Built 1948 Load: 35.4 t ADT: 2,562

I-80 EB

Fair

Over: OVER WHITE DEER CREEK

5 MI W OF WHITE DEER, Union, PA

Built 1970 Load: 36.3 t ADT: 9,978

T-347 (CTY BR 15)

Fair

Over: N. BRANCH BUFFALO CREEK

1.1 MI NNE OF MIFFLINBURG, Union, PA

Built 1934 Load: 36.3 t ADT: 110

SR 192

Fair

Over: OVER RAPID RUN

2 MI SE OF R B W STATE PK, Union, PA

Built 1936 Load: 37.2 t ADT: 870

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.