County profile · official public datasets

Tioga County, PA

429 public highway bridges tracked in the FHWA National Bridge Inventory: 49.4% rated Good, 47.3% Fair, 3.3% Poor.

429
Public bridges: 49.4%
Good condition: 3.3%
Poor condition

The verdict

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

Tioga County pairs a top-5% lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 3%
lowest Poor share in state: 3.3%
Poor-condition share: 429
public highway bridges: 1977
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.

Tioga County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Tioga County ranks #2 of 67 Pennsylvania counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.3%). Tioga County, Pennsylvania contains 429 public highway bridges. Roughly 49.4% are rated “Good,” 47.3% “Fair,” and 3.3% “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

429

Public highway bridges in Tioga County

Good condition

49.4%

212 of 429 rated 7-9

Fair condition

47.3%

203 of 429 rated 5-6

Poor condition

3.3%

14 of 429 rated 4 or below

In-state Poor-share rank

#2 of 67

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

Condition distribution

Share of 429 NBI-tracked bridges by lowest applicable component rating.

Good

49.4% (212)

Fair

47.3% (203)

Poor

3.3% (14)

Tioga County's Poor-condition bridges carry 9,804 vehicle crossings a day

That is 1.6% of the county's reported daily bridge traffic on 3.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 700 crossings a day against 1,762 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 428 of 429 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

45.2% of Tioga County's bridges have passed the 50-year mark

194 of the 429 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 49.4% 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 43.7% of the county's Poor-condition bridge traffic

SR 4002 over CHARLESTON RUN, built 1935, carries 4,289 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 14-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 9,804 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

2
1900s

6
1910s

4
1920s

8
1930s

33
1940s

22
1950s

47
1960s

39
1970s

54
1980s

57
1990s

36
2000s

61
2010s

46
2020s

14

What this shows Construction peaked in the 2000s, when 61 of the county's bridges still in the inventory were built, which is 14.2% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1977, 7 years newer than the Pennsylvania average of 1970.

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

The 5 Pennsylvania counties nearest Tioga County in number of bridges, with their condition splits. Its 3.3% Poor share is the 1st-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1971 is 6 years newer.

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

Bridge inventory size and condition shares for Tioga County and the 5 Pennsylvania counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Dauphin County	449	22%	69.5%	8.5%	1972
Erie County	442	37.8%	52.7%	9.5%	1976
Mercer County	438	39.3%	45.2%	15.5%	1972
Tioga County (this page)	429	49.4%	47.3%	3.3%	1977
Fayette County	422	39.6%	42.7%	17.8%	1971
Bedford County	417	30%	60.9%	9.1%	1965

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

Similar inventory size

Nearest county inventories outside PA (429 bridges here).

Hampden County, MA · 428 bridges
Rutherford County, TN · 428 bridges
Smith County, TX · 427 bridges
Plymouth County, IA · 432 bridges

Similar average build year

Nearest mean year-built outside PA (1977 here).

San Diego County, CA · avg 1977 · 1,632 bridges
King County, WA · avg 1977 · 1,238 bridges
Riverside County, CA · avg 1977 · 1,117 bridges
Shelby County, TN · avg 1977 · 1,077 bridges

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

All 429 Good 212 Fair 203 Poor 14

Fair-condition bridges (203)

Sort:

Tioga County Bridge Snapshot

Condition distribution

Tioga County's Poor-condition bridges carry 9,804 vehicle crossings a day

45.2% of Tioga County's bridges have passed the 50-year mark

One structure carries 43.7% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (203)

SR 3014

T-787 LAWRENCE TWP

T-339

T-496

T-462

SR 0006

SR 0006

SR15 NOW SR 2005

PA 49

SR 49

SR 414

PA 660

SR 1001

SR 1004

SR 1013

SR 2002

SR 2014

SR 2014

SR 2016

SR 2017

SR 2018

SR 2022

SR 2022

SR 2022

SR 2022

SR 2027

SR 3005

SR 4009

SR 4012

SR 4017

SR 4027

SR 4035

SR 4098

SR 15

T-684

T-572 OSCEOLA TWP.

T-836 SULLIVAN TWP

KELLYS SWAMP LANE

SR 549

SR 1005

SR 2016

SR 4007

US 6

SR 0549

SR 2002

SR 4005

SR 4008

SR 4013

SR 15 SOUTH BOUND

SR 49

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