County profile · official public datasets

Hardin County, OH

276 public highway bridges tracked in the FHWA National Bridge Inventory: 64.1% rated Good, 28.6% Fair, 7.2% Poor.

276
Public bridges
64.1%
Good condition
7.2%
Poor condition

The verdict

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

Hardin County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

67th
of 88 on Poor share
7.2%
Poor-condition share
276
public highway bridges
1979
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.

Hardin County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Hardin County ranks #67 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.2%). Hardin County, Ohio contains 276 public highway bridges. Roughly 64.1% are rated “Good,” 28.6% “Fair,” and 7.2% “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

276

Public highway bridges in Hardin County

Good condition

64.1%

177 of 276 rated 7-9

Fair condition

28.6%

79 of 276 rated 5-6

Poor condition

7.2%

20 of 276 rated 4 or below

In-state Poor-share rank

#67 of 88

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

Condition distribution

Share of 276 NBI-tracked bridges by lowest applicable component rating.

Good
64.1% (177)
Fair
28.6% (79)
Poor
7.2% (20)

Hardin County's Poor-condition bridges carry 7,215 vehicle crossings a day

That is 4.3% of the county's reported daily bridge traffic on 7.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 361 crossings a day against 659 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 276 of 276 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

40.9% of Hardin County's bridges have passed the 50-year mark

113 of the 276 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 64.1% 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 20.3% of the county's Poor-condition bridge traffic

LEIGHTON STREET over SCIOTO RIVER, built 1993, carries 1,463 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 20-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 7,215 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Hardin County's bridges were built

276 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 46 of the county's bridges still in the inventory were built, which is 16.7% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1979) matches the Ohio average (1977).

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

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

The 5 Ohio counties nearest Hardin County in number of bridges, with their condition splits. Its 7.2% Poor share is the 6th-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1982 is in line with the group.

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

Bridge inventory size and condition shares for Hardin County and the 5 Ohio counties closest to it in inventory size
County Bridges Poor
Ashland County 283 2.5%
Logan County 281 1.1%
Shelby County 277 2.5%
Hardin County (this page) 276 7.2%
Seneca County 275 1.5%
Knox County 274 5.5%

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

Similar inventory size

Nearest county inventories outside OH (276 bridges here).

Similar average build year

Nearest mean year-built outside OH (1979 here).

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

All 276 Good 177 Fair 79 Poor 20

Fair-condition bridges (79)

COUNTY ROAD 265

Fair

Over: SCIOTO RIVER

.2 MI S OF JCT OF C.R.144, Hardin, OH

Built 1973 Load: 38.9 t ADT: 259

TOWNSHIP ROAD 65

Fair

Over: BADER DITCH

AT JCT OF CR 150, Hardin, OH

Built 1985 Load: 38.9 t ADT: 65

TOWNSHIP ROAD 255

Fair

Over: MCDONALD CREEK

.1 MI N.OF JCT OF TWP 230, Hardin, OH

Built 1977 Load: 38.9 t ADT: 150

TOWNSHIP ROAD 56

Fair

Over: BLANCHARD RIVER

.1 MI W OF JCT OF TWP.173, Hardin, OH

Built 1977 Load: 38.9 t ADT: 324

SR 67

Fair

Over: TYMOCHTEE CREEK

3.36 mi. North of USR68, Hardin, OH

Built 1983 Load: 41.1 t ADT: 1,723

COUNTY ROAD 230

Fair

Over: SOUTH WILDCAT CREEK

.5 MI E OF TWP 217, Hardin, OH

Built 1951 Load: 42.1 t ADT: 533

TOWNSHIP ROAD 85

Fair

Over: MATHEWS DITCH

.3 MI N OF JCT OF CR 60, Hardin, OH

Built 1918 Load: 42.1 t ADT: 351

COUNTY ROAD 95

Fair

Over: HOG CREEK DITCH

.2 MI S OF JCT OF TWP 50, Hardin, OH

Built 1920 Load: 42.1 t ADT: 123

TOWNSHIP ROAD 104

Fair

Over: LITTLE TYMOCHTEE

.3 MI W OF JCT OF CR 195, Hardin, OH

Built 1972 Load: 42.1 t ADT: 324

COUNTY ROAD 20

Fair

Over: BLANCHARD RIVER

.3 MI W OF JCT OF CR 183, Hardin, OH

Built 1963 Load: 42.1 t ADT: 162

TOWNSHIP ROAD 165

Fair

Over: LEASE DITCH

.2 MI.S. OF JCT OF TWP.46, Hardin, OH

Built 1927 Load: 42.1 t ADT: 16

WAYNE STREET

Fair

Over: SCIOTO RIVER

AT JCT. OF DECATUR ST., Hardin, OH

Built 1988 Load: 42.1 t ADT: 3,000

COUNTY ROAD 14

Fair

Over: HYDRAULIC DITCH

.2 MI E OF JCT OF CR 113, Hardin, OH

Built 1957 Load: 44.4 t ADT: 194

COUNTY ROAD 159

Fair

Over: BAERTSCHE DITCH

.02 M S OF JCT OF TWP 40, Hardin, OH

Built 1994 Load: 44.4 t ADT: 81

COUNTY ROAD 110

Fair

Over: DANIELS DITCH

.7 MI W OF JCT OF TWP 205, Hardin, OH

Built 1997 Load: 44.4 t ADT: 350

COUNTY ROAD 21

Fair

Over: FREDERICK AT CO. DITCH

.5 MI. N OF JCT CR 150, Hardin, OH

Built 1995 Load: 44.4 t ADT: 140

TOWNSHIP ROAD 50

Fair

Over: MATHEWS DITCH

.3 MI E OF JCT OF TWP 85, Hardin, OH

Built 1922 Load: 45.4 t ADT: 324

COUNTY ROAD 175

Fair

Over: BLANCHARD RIVER LAT

.4 MI N. OF JCT OF TWP 56, Hardin, OH

Built 1966 Load: 45.4 t ADT: 1,109

TOWNSHIP ROAD 179

Fair

Over: WOLF CREEK

.1 MI N OF JCT OF TWP 265, Hardin, OH

Built 1910 Load: 45.4 t ADT: 351

COUNTY ROAD 190

Fair

Over: WILDCAT CREEK

.8 MI. E OF JCT OF TWP245, Hardin, OH

Built 1930 Load: 48.6 t ADT: 262

COUNTY ROAD 190

Fair

Over: WILDCAT CREEK

.1 MI.W OF JCT. OF TWP255, Hardin, OH

Built 1900 Load: 48.6 t ADT: 262

COUNTY ROAD 175

Fair

Over: SCIOTO RIVER

.1 MI N OF JCT OF TWP 140, Hardin, OH

Built 1965 Load: 48.6 t ADT: 1,110

TOWNSHIP ROAD 55

Fair

Over: GRASS RUN

.1 MI N OF JCT OF CR 40, Hardin, OH

Built 1959 Load: 48.6 t ADT: 110

TOWNSHIP ROAD 180

Fair

Over: SILVER CREEK

.6 MI E OF JCT OF C R 115, Hardin, OH

Built 1965 Load: 51.8 t ADT: 324

TOWNSHIP ROAD 179

Fair

Over: PANTHER CREEK

.2 MI N OF JCT OF SR 273, Hardin, OH

Built 1964 Load: 51.8 t ADT: 324

TOWNSHIP ROAD 74

Fair

Over: LITTLE TYMOCHTEE

.5 MI E OF JCT OF CR 195, Hardin, OH

Built 1915 Load: 51.8 t ADT: 324

TOWNSHIP ROAD 245

Fair

Over: SOUTH WILDCAT CREEK

.4 MI N OF JCT OF C.R.202, Hardin, OH

Built 1964 Load: 64.8 t ADT: 324

TOWNSHIP ROAD 80

Fair

Over: SAMS DITCH

.2 MI W OF JCT OF CR 135, Hardin, OH

Built 1981 Load: 71.3 t ADT: 351

COUNTY ROAD 75

Fair

Over: FITCHU DITCH

AT JCT. OF TWP. 30, Hardin, OH

Built 1918 Load: 84.2 t ADT: 129

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.