County profile · official public datasets

Allen County, OH

367 public highway bridges tracked in the FHWA National Bridge Inventory: 67.6% rated Good, 22.6% Fair, 9.8% Poor.

367
Public bridges: 67.6%
Good condition: 9.8%
Poor condition

The verdict

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

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

82nd
of 88 on Poor share: 9.8%
Poor-condition share: 367
public highway bridges: 1982
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.

Allen County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Allen County ranks #82 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.8%). Allen County, Ohio contains 367 public highway bridges. Roughly 67.6% are rated “Good,” 22.6% “Fair,” and 9.8% “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.

Total bridges

367

Public highway bridges in Allen County

Good condition

67.6%

248 of 367 rated 7-9

Fair condition

22.6%

83 of 367 rated 5-6

Poor condition

9.8%

36 of 367 rated 4 or below

In-state Poor-share rank

#82 of 88

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

Condition distribution

Share of 367 NBI-tracked bridges by lowest applicable component rating.

Good

67.6% (248)

Fair

22.6% (83)

Poor

9.8% (36)

Allen County's Poor-condition bridges carry 46,557 vehicle crossings a day

That is 4.1% of the county's reported daily bridge traffic on 9.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,293 crossings a day against 3,530 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 367 of 367 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

40.6% of Allen County's bridges have passed the 50-year mark

149 of the 367 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 67.6% 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 19.7% of the county's Poor-condition bridge traffic

LIMA - BLUELICK RD over SUGAR CREEK - BLUELICK R, built 1970, carries 9,159 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 36-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 46,557 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

1
1920s

4
1930s

3
1940s

6
1950s

24
1960s

71
1970s

72
1980s

45
1990s

58
2000s

27
2010s

48
2020s

7

What this shows Construction peaked in the 1970s, when 72 of the county's bridges still in the inventory were built, which is 19.6% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1982, 5 years newer than the Ohio average of 1977.

How Allen County compares with Ohio's closest counties by inventory size

The 5 Ohio counties nearest Allen County in number of bridges, with their condition splits. Its 9.8% Poor share is the 5th-lowest of these 6. Its average build year of 1982 against a peer-group mean of 1980 is in line with the group.

Showing the 5 closest of 87 Ohio counties eligible for comparison.

Bridge inventory size and condition shares for Allen County and the 5 Ohio counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Butler County	377	62.3%	32.9%	4.8%	1985
Scioto County	376	65.7%	29.3%	5.1%	1984
Allen County (this page)	367	67.6%	22.6%	9.8%	1982
Lorain County	366	53.8%	40.7%	5.5%	1973
Muskingum County	363	58.1%	32%	9.9%	1969
Hancock County	357	72.3%	26.3%	1.4%	1988

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

Similar inventory size

Nearest county inventories outside OH (367 bridges here).

Clackamas County, OR · 367 bridges
Centre County, PA · 367 bridges
Schuylkill County, PA · 368 bridges
Sullivan County, TN · 368 bridges

Similar average build year

Nearest mean year-built outside OH (1982 here).

Oklahoma County, OK · avg 1982 · 1,216 bridges
Jackson County, MO · avg 1982 · 930 bridges
Milwaukee County, WI · avg 1982 · 893 bridges
Champaign County, IL · avg 1982 · 727 bridges

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

All 367 Good 248 Fair 83 Poor 36

Good-condition bridges (248)

Sort:

Allen County Bridge Snapshot

Condition distribution

Allen County's Poor-condition bridges carry 46,557 vehicle crossings a day

40.6% of Allen County's bridges have passed the 50-year mark

One structure carries 19.7% of the county's Poor-condition bridge traffic

How Allen County compares with Ohio's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (248)

CR 165 SLABTOWN RD

IR 75 SB

IR 75 SB

IR 75 NB

IR 75 SB

IR 75 NB

SR 81

SR 81

SR 117

SR 117 FOURTH ST

AGERTER RD

SWANEY RD.

BLISS RD.

PUTNAM CO LINE

PIQUAD RD.

BENTLEY RD.

RESERVOIR RD.

GOOD ROAD

LIMA - 4TH ST

IRVIN RD.

FRANKLIN STREET

SR 117

SLABTOWN RD.

SLABTOWN RD.

SUGAR ST.

MCCLAIN RD.

SR 309 JAMESON AVE

THAYER RD

COOL RD.

AMHERST RD.

CR 165 SLABTOWN RD

IR 75 SB

IR 75 NB

CR190 RESERVOIR RD

CR 110 BIBLE RD

TR 224 SWANEY RD

SR 117

PIQUAD RD.

DIXIE HWY

NEFF RD

ELIZABETH STREET

SEVENTH STREET

DIXIE HWY N.

MUMAUGH RD

SEARFOSS RD.

CR 13 McCLAIN RD

CR 196 HANTHORN RD

REAM RD

RESERVOIR RD

AMHERST

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