County profile · official public datasets

Blair County, PA

338 public highway bridges tracked in the FHWA National Bridge Inventory: 39.1% rated Good, 50.9% Fair, 10.1% Poor.

338
Public bridges
39.1%
Good condition
10.1%
Poor condition

The verdict

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

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

Top 40%
lowest Poor share in state
10.1%
Poor-condition share
338
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.

Blair County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Blair County ranks #27 of 67 Pennsylvania counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.1%). Blair County, Pennsylvania contains 338 public highway bridges. Roughly 39.1% are rated “Good,” 50.9% “Fair,” and 10.1% “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

338

Public highway bridges in Blair County

Good condition

39.1%

132 of 338 rated 7-9

Fair condition

50.9%

172 of 338 rated 5-6

Poor condition

10.1%

34 of 338 rated 4 or below

In-state Poor-share rank

#27 of 67

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

Condition distribution

Share of 338 NBI-tracked bridges by lowest applicable component rating.

Good
39.1% (132)
Fair
50.9% (172)
Poor
10.1% (34)

Blair County's Poor-condition bridges carry 27,955 vehicle crossings a day

That is 1.9% of the county's reported daily bridge traffic on 10.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 822 crossings a day against 4,843 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 338 of 338 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

40.5% of Blair County's bridges have passed the 50-year mark

137 of the 338 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 39.1% 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 20.4% of the county's Poor-condition bridge traffic

25TH AVENUE over SPRING RUN, built 1961, carries 5,701 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 34-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 27,955 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Blair County's bridges were built

338 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 73 of the county's bridges still in the inventory were built, which is 21.6% of those with a recorded year. That cohort is now 35 to 44 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 Blair County compares with Pennsylvania's closest counties by inventory size

The 5 Pennsylvania counties nearest Blair County in number of bridges, with their condition splits. Its 10.1% Poor share is the 4th-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1973 is in line with the group.

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

Bridge inventory size and condition shares for Blair County and the 5 Pennsylvania counties closest to it in inventory size
County Bridges Poor
Centre County 367 6%
Lackawanna County 363 17.6%
Northampton County 356 9.3%
Cumberland County 348 4.9%
Blair County (this page) 338 10.1%
Monroe County 315 21%

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

Similar inventory size

Nearest county inventories outside PA (338 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 338 Good 132 Fair 172 Poor 34

All bridges (338)

SR 3002

Good

Over: SOUTH POPLAR RUN

0.7 MI N OF SR 3005, Blair, PA

Built 2006 Load: 42.6 t ADT: 892

I-99 / US 220 NBL

Good

Over: SR 0350

1.07 MI NORTH OF EXIT 52, Blair, PA

Built 2006 Load: 42.6 t ADT: 6,883

Cottontown Rd

Good

Over: BEAVERDAM CREEK

0.7 MI SW OF SPROUL, Blair, PA

Built 2018 Load: 43.1 t ADT: 577

US 22

Good

Over: GILLANS RUN

.5 MI.N.OF DUNCANSVILLE, Blair, PA

Built 1994 Load: 43.5 t ADT: 11,775

SR 1013

Good

Over: SINKING RUN

.75 MI.E.OF ARCH SPRING, Blair, PA

Built 1999 Load: 43.5 t ADT: 696

SR 2008

Good

Over: HALTER CREEK

36 FT. EAST OF SR 0036, Blair, PA

Built 1996 Load: 43.5 t ADT: 490

SR 3013

Good

Over: PINE RUN

.75 MI.N.OF SPROUL, Blair, PA

Built 1957 Load: 43.5 t ADT: 5,761

SR 4010 (17TH ST)

Good

Over: I-99 / US 220

0.1 MI. E. OF ALTOONA, Blair, PA

Built 1992 Load: 43.5 t ADT: 25,718

I-99 / US 220 SBL

Good

Over: SR 0350

1.07 MI NORTH OF EXIT 52, Blair, PA

Built 2006 Load: 43.5 t ADT: 6,583

US 22

Good

Over: BLAIR GAP RUN

0.56 MILE E. FROM SR 3012, Blair, PA

Built 2007 Load: 43.5 t ADT: 14,932

SR 2005

Good

Over: CLOVER CREEK

.25 MI. N. OF HENRIETTA, Blair, PA

Built 2009 Load: 43.5 t ADT: 152

SR 4027

Good

Over: BIG FILL RUN

BALD EAGLE, Blair, PA

Built 1913 Load: 44.5 t ADT: 1,510

SR 1013

Good

Over: SINKING RUN

1 MI.E.OF ARCH SPRING, Blair, PA

Built 1999 Load: 44.5 t ADT: 696

T-406 MILL ROAD

Good

Over: GILLANS RUN

1 MI.NW.OF DUNCANSVILLE, Blair, PA

Built 2004 Load: 44.5 t ADT: 282

T432 BURNS AVENUE

Good

Over: SUGAR RUN

2.5 MI.SO.OF ALTOONA, Blair, PA

Built 1990 Load: 44.5 t ADT: 2,838

I-99 / US 220 NBL

Good

Over: SR 4041

0.7 MI S OF BALD EAGLE, Blair, PA

Built 2006 Load: 44.5 t ADT: 6,883

PA 36

Good

Over: FRANKSTOWN BR JUNIATA R

1.2 MILE SOUTH OF CATFISH, Blair, PA

Built 2010 Load: 44.5 t ADT: 7,353

I-99 / US 220 NBL

Good

Over: PA 865/SR 1008 @ EXIT 41

0.3 MI. E. OF BELLWOOD, Blair, PA

Built 1992 Load: 45.4 t ADT: 10,584

I-99 / US 220 SBL

Good

Over: PA 865 @ EXIT 41

0.3MI.E.OF BELLWOOD, Blair, PA

Built 1992 Load: 45.4 t ADT: 10,064

SR 4015

Good

Over: BELLS GAP RUN

1 MI. W. OF BELLWOOD, Blair, PA

Built 2007 Load: 45.4 t ADT: 1,335

PA 164

Good

Over: SOUTH DRY RUN

1 MI.W.OF EAST FREEDOM, Blair, PA

Built 2001 Load: 46.3 t ADT: 1,368

SR 3010

Good

Over: POPLAR RUN

PUZZLETOWN, Blair, PA

Built 2005 Load: 46.3 t ADT: 460

SR 3010

Good

Over: TRIB POPLAR RUN

1.25 MI.W.OF PUZZLETOWN, Blair, PA

Built 1936 Load: 47.2 t ADT: 56

SR 1011

Good

Over: CANOE CREEK

3 MI.N.OF CANOE CREEK, Blair, PA

Built 2004 Load: 47.2 t ADT: 160

I-99 / US 220 SBL

Good

Over: SR 4041

0.7 MI. S. OF BALD EAGLE, Blair, PA

Built 2006 Load: 47.2 t ADT: 6,583

SR 4003 BROAD AVE

Good

Over: MILL RUN

ALTOONA BROAD AVENUE, Blair, PA

Built 2010 Load: 47.2 t ADT: 5,951

I-99 / US 220 NBL

Good

Over: PA 764/SR 1018 @ EXIT 39

1 MI EAST OF PINECROFT, Blair, PA

Built 1994 Load: 48.1 t ADT: 9,374

I-99 / US 220 SBL

Good

Over: PA 764 @ EXIT 39

1 MI EAST OF PINECROFT, Blair, PA

Built 1994 Load: 48.1 t ADT: 10,286

SR 3013

Good

Over: SOUTH POPLAR RUN

0.25 MI N OF CLAYSBURG, Blair, PA

Built 1957 Load: 48.1 t ADT: 6,540

SR 3010

Good

Over: BLUE KNOB RUN

PUZZELTOWN, Blair, PA

Built 2005 Load: 48.1 t ADT: 460

PA 764 & TURN LANE

Good

Over: KETTLE CREEK

GREENWOOD, Blair, PA

Built 2007 Load: 48.1 t ADT: 3,147

SR 4020

Good

Over: BELLS GAP RUN

.5 MI.W.OF BELLWOOD, Blair, PA

Built 1987 Load: 49.0 t ADT: 571

SR 2014

Good

Over: BEAVERDAM BR JUNIATA RIV

HOLLIDAYSBURG BOROUGH, Blair, PA

Built 2010 Load: 49.0 t ADT: 2,060

T325 Walnut Street

Good

Over: FRANK.BR.JUNIATA RIVER

CLAYSBURG, Blair, PA

Built 1994 Load: 49.9 t ADT: 205

PA 36/ PA 164

Good

Over: HALTER CREEK

VILLAGE OF MCKEE, Blair, PA

Built 1951 Load: 50.8 t ADT: 18,702

I-99 / US 220

Good

Over: PRIVATE ROAD

.2 MI.N.OF DUNCANSVILLE, Blair, PA

Built 1983 Load: 50.8 t ADT: 16,449

CR-101 Bedford St

Good

Over: POLECAT RUN

1 MI.N.OF CLAYSBURG, Blair, PA

Built 2005 Load: 50.8 t ADT: 822

PA 36

Good

Over: HALTER CREEK

1.5 MILE NORTH OF MCKEE, Blair, PA

Built 2010 Load: 50.8 t ADT: 7,122

SR 1013

Good

Over: LITTLE JUNIATA RIVER

2 MI.E.OF ARCH SPRING, Blair, PA

Built 1989 Load: 51.7 t ADT: 516

SR 2017

Good

Over: FOX RUN

1.75 MI.N.OF MT.ETNA, Blair, PA

Built 1940 Load: 51.7 t ADT: 137

PA 453

Good

Over: SINK RUN

TYRONE BOROUGH, Blair, PA

Built 1941 Load: 52.6 t ADT: 1,759

T349 CLOVER CRK RD

Good

Over: CLOVER CREEK

1 MI.S.OF SHELLYTOWN, Blair, PA

Built 1952 Load: 52.6 t ADT: 764

KETTLE RD; SR 1013

Good

Over: SINKING RUN

.75 MI NE OF CULP, Blair, PA

Built 2017 Load: 53.1 t ADT: 530

SR 3002

Good

Over: SOUTH POPLAR RUN

1.4 MI.W.OF CLAYSBURG, Blair, PA

Built 1989 Load: 54.4 t ADT: 1,537

T527 DECKER HOLLOW

Good

Over: VANSCOYOC RUN

4.5 MI.N.OF TYRONE, Blair, PA

Built 1936 Load: 54.4 t ADT: 129

SR 4016

Good

Over: KETTLE CREEK

VILLAGE OF GREENWOOD, Blair, PA

Built 1952 Load: 57.2 t ADT: 7,045

SR 1013

Good

Over: SINKING RUN

1.25 MI.E.OF ARCH SPRING, Blair, PA

Built 1999 Load: 59.0 t ADT: 696

PA 164

Good

Over: TR.PLUM CREEK

1.25 MI.W.OF MARTINSBURG, Blair, PA

Built 1966 Load: 59.9 t ADT: 9,228

T527 DECKER HOLLOW

Good

Over: DECKER RUN

0.1 MILE NORTH OF TYRONE, Blair, PA

Built 1937 Load: 61.7 t ADT: 129

PA 764/BUS US 220

Good

Over: SMALL RUN

2 MI.N.OF GREENWOOD, Blair, PA

Built 1993 Load: 62.6 t ADT: 9,538

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.