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.

When Allen County's bridges were built

367 bridges with a recorded construction year, grouped by decade

bridges

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.

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

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 Poor
Butler County 377 4.8%
Scioto County 376 5.1%
Allen County (this page) 367 9.8%
Lorain County 366 5.5%
Muskingum County 363 9.9%
Hancock County 357 1.4%

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).

Similar average build year

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

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

All bridges (367)

BLUF - MAIN ST

Poor

Over: MARSH RUN - DIXIE HWY

0.46 MI SW CL @ AC&Y RR, Allen, OH

Built 1927 Load: 24.3 t ADT: 3,640

REAM RD.

Poor

Over: AUGLAIZE RIVER REAM RD

0.53 MI N OF AMHERST RD, Allen, OH

Built 1974 Load: 27.9 t ADT: 323

BLUF - MAIN ST

Poor

Over: RILEY CREEK - DIXIE HWY

0.47 MI SW COUNTY LINE, Allen, OH

Built 1925 Load: 29.2 t ADT: 3,481

GOMER RD

Poor

Over: PIKE RUN - GOMER RD

0.10 MI N OF LINCOLN HWY, Allen, OH

Built 1951 Load: 29.2 t ADT: 508

SUNDERLAND RD.

Poor

Over: STREAM SUNDERLAND RD

0.11 MI S OF SR 117, Allen, OH

Built 1977 Load: 32.4 t ADT: 343

BLUFF COLLEGE AVE

Poor

Over: LITTLE RILEY COLLEGE AVE

0.13 MI NW OF LAWN AVE, Allen, OH

Built 1961 Load: 32.4 t ADT: 1,046

PUTNAM CO. LINE

Poor

Over: STREAM PUT CO LN

0.18 MI E OF TOM FETT RD, Allen, OH

Built 1975 Load: 32.4 t ADT: 509

LUGABILL RD.

Poor

Over: CRANBERRY LUGABILL RD

0.13 MI E OF COOL RD, Allen, OH

Built 1976 Load: 32.4 t ADT: 351

SANDY POINT RD.

Poor

Over: BEAVER RUN SANDY POINT

0.65 MI N OF IRVIN RD, Allen, OH

Built 1975 Load: 32.4 t ADT: 327

LINCOLN HWY.

Poor

Over: PIKE RUN LINCOLN HWY

0.30 MI W OF SANDY POINT, Allen, OH

Built 1955 Load: 32.4 t ADT: 671

LINCOLN HWY.

Poor

Over: SUGAR CREEK LINCOLN HWY

0.18 MI E OF SR 115, Allen, OH

Built 1960 Load: 35.6 t ADT: 537

WONNELL RD.

Poor

Over: AUGLAIZE RIVER WONNELL

.O9 MI E OF SCHOOLER RD, Allen, OH

Built 1985 Load: 37.3 t ADT: 109

SCHOOLER RD.

Poor

Over: AUGLAIZE RIVER SCHOOLER

0.26 MI N OF WARSAW RD, Allen, OH

Built 1985 Load: 38.6 t ADT: 600

LIMA - BLUELICK RD

Poor

Over: SUGAR CREEK - BLUELICK R

0.76 MI E OF SR 65, Allen, OH

Built 1970 Load: 39.2 t ADT: 9,159

RUMBAUGH RD.

Poor

Over: STREAM RUMBAUGH RD

0.13 MI N OF RESERVOIR, Allen, OH

Built 1962 Load: 45.4 t ADT: 904

BLUF - BENTLEY

Poor

Over: LITTLE RILEY - BENTLEY R

0.04 MI N OF GROVE ST, Allen, OH

Built 1960 Load: 48.6 t ADT: 1,404

WAPAK RD.

Poor

Over: HONEY RUN WAPAK RD

0.47 MI S OF STATE RD, Allen, OH

Built 1977 Load: 55.1 t ADT: 337

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.