County profile · official public datasets

Carroll County, OH

125 public highway bridges tracked in the FHWA National Bridge Inventory: 41.6% rated Good, 53.6% Fair, 4.8% Poor.

125
Public bridges: 41.6%
Good condition: 4.8%
Poor condition

The verdict

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

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

46th
of 88 on Poor share: 4.8%
Poor-condition share: 125
public highway bridges: 1974
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.

Carroll County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Carroll County ranks #46 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.8%). Carroll County, Ohio contains 125 public highway bridges. Roughly 41.6% are rated “Good,” 53.6% “Fair,” and 4.8% “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

125

Public highway bridges in Carroll County

Good condition

41.6%

52 of 125 rated 7-9

Fair condition

53.6%

67 of 125 rated 5-6

Poor condition

4.8%

6 of 125 rated 4 or below

In-state Poor-share rank

#46 of 88

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

Condition distribution

Share of 125 NBI-tracked bridges by lowest applicable component rating.

Good

41.6% (52)

Fair

53.6% (67)

Poor

4.8% (6)

Carroll County's Poor-condition bridges carry 1,453 vehicle crossings a day

That is 0.9% of the county's reported daily bridge traffic on 4.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 242 crossings a day against 1,751 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 125 of 125 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

49.6% of Carroll County's bridges have passed the 50-year mark

62 of the 125 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 41.6% 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 25.7% of the county's Poor-condition bridge traffic

COUNTY RD 27 over CENTER FORK DRAKE BN04, built 1960, carries 373 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 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,453 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

3
1910s

2
1920s

4
1930s

3
1940s

9
1950s

13
1960s

22
1970s

14
1980s

13
1990s

14
2000s

21
2010s

4
2020s

3

What this shows Construction peaked in the 1960s, when 22 of the county's bridges still in the inventory were built, which is 17.6% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1974) matches the Ohio average (1977).

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

The 5 Ohio counties nearest Carroll County in number of bridges, with their condition splits. Its 4.8% Poor share is the 4th-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1974 is in line with the group.

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

Bridge inventory size and condition shares for Carroll County and the 5 Ohio counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Morgan County	159	52.8%	43.4%	3.8%	1962
Defiance County	158	77.8%	20.9%	1.3%	1991
Ottawa County	158	65.8%	32.9%	1.3%	1973
Geauga County	141	64.5%	29.1%	6.4%	1985
Harrison County	140	40%	42.1%	17.9%	1959
Carroll County (this page)	125	41.6%	53.6%	4.8%	1974

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

Similar inventory size

Nearest county inventories outside OH (125 bridges here).

Hoonah-Angoon County, AK · 125 bridges
Tuolumne County, CA · 125 bridges
Worth County, GA · 125 bridges
Stone County, MS · 125 bridges

Similar average build year

Nearest mean year-built outside OH (1974 here).

Knox County, TN · avg 1974 · 588 bridges
Onondaga County, NY · avg 1974 · 472 bridges
Orange County, NY · avg 1974 · 472 bridges
Pierce County, WA · avg 1974 · 472 bridges

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

All 125 Good 52 Fair 67 Poor 6

Good-condition bridges (52)

Sort:

Carroll County Bridge Snapshot

Condition distribution

Carroll County's Poor-condition bridges carry 1,453 vehicle crossings a day

49.6% of Carroll County's bridges have passed the 50-year mark

One structure carries 25.7% of the county's Poor-condition bridge traffic

How Carroll 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 (52)

SR 542

SR39

COUNTY ROAD 63

CO RD 14

SR 09 & SR 43

T 260A MAYHEM RD

COUNTY ROAD 69

T 227 LILAC RD

FOX TWP RL 586

HAR TWP RD 162

T 314 ORCHARD RD

COUNTY RD 21

LOU TWP RD 389

T 108 & ORANGE DR

SR164

HAR TWP RD 272

SR 09

SR 39

SR332

SR 542

HAR TWP 150

COUNTY ROAD 8

COUNTY RD 71

SR43 & SR183

SR 43

COUNTY ROAD 68

WASHINGTON TR 273

COUNTY ROAD 12

COUNTY ROAD 10

SR43 & SR183

CENTER TWP 147A

COUNTY ROAD 21

COUNTY RD 14

AGUSTA TWP 411

SR 332

CR 66

COUNTY RD 29

COUNTY ROAD 30

SR 542

S.R. 9

SR164

SR 183

SR 542

Pebble Road

SR 542

S.R. 43

SR 39 & SR 212

SR 43

COUNTY RD 15

COUNTY RD 22

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