County profile · official public datasets

Harrison County, OH

140 public highway bridges tracked in the FHWA National Bridge Inventory: 40% rated Good, 42.1% Fair, 17.9% Poor.

140
Public bridges: 40%
Good condition: 17.9%
Poor condition

The verdict

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

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

88th
of 88 on Poor share: 17.9%
Poor-condition share: 140
public highway bridges: 1959
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.

Harrison County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Harrison County ranks #88 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 17.9%). Harrison County, Ohio contains 140 public highway bridges. Roughly 40% are rated “Good,” 42.1% “Fair,” and 17.9% “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

140

Public highway bridges in Harrison County

Good condition

40%

56 of 140 rated 7-9

Fair condition

42.1%

59 of 140 rated 5-6

Poor condition

17.9%

25 of 140 rated 4 or below

In-state Poor-share rank

#88 of 88

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

Condition distribution

Share of 140 NBI-tracked bridges by lowest applicable component rating.

Good

40% (56)

Fair

42.1% (59)

Poor

17.9% (25)

Harrison County's Poor-condition bridges carry 16,658 vehicle crossings a day

That is 8.7% of the county's reported daily bridge traffic on 17.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 666 crossings a day against 2,052 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 140 of 140 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

64.3% of Harrison County's bridges have passed the 50-year mark

90 of the 140 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 40% 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 23.3% of the county's Poor-condition bridge traffic

US 22 WB over COLUMBUS & OHIO R.RR, built 1960, carries 3,875 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 25-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 16,658 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1900s

26
1920s

2
1930s

6
1940s

6
1950s

16
1960s

28
1970s

8
1980s

9
1990s

16
2000s

12
2010s

8
2020s

2

What this shows Construction peaked in the 1960s, when 28 of the county's bridges still in the inventory were built, which is 20% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1959, 18 years older than the Ohio average of 1977.

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

The 5 Ohio counties nearest Harrison County in number of bridges, with their condition splits. Its 17.9% Poor share is the 6th-lowest of these 6. Its average build year of 1959 against a peer-group mean of 1977 is 18 years older.

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

Bridge inventory size and condition shares for Harrison 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 (this page)	140	40%	42.1%	17.9%	1959
Carroll County	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 Harrison 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 Harrison County, both outside Ohio so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OH (140 bridges here).

Henry County, GA · 140 bridges
Geary County, KS · 140 bridges
Colfax County, NM · 140 bridges
Wyoming County, PA · 140 bridges

Similar average build year

Nearest mean year-built outside OH (1959 here).

Tulare County, CA · avg 1959 · 589 bridges
Barton County, KS · avg 1959 · 449 bridges
Nassau County, NY · avg 1959 · 328 bridges
Marion County, KS · avg 1959 · 324 bridges

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

All 140 Good 56 Fair 59 Poor 25

Fair-condition bridges (59)

Sort:

Harrison County Bridge Snapshot

Condition distribution

Harrison County's Poor-condition bridges carry 16,658 vehicle crossings a day

64.3% of Harrison County's bridges have passed the 50-year mark

One structure carries 23.3% of the county's Poor-condition bridge traffic

How Harrison 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

Fair-condition bridges (59)

COUNTY RD 13

COUNTY RD 24

TOWNSHIP RD 74

TOWNSHIP RD 235

WATER STREET

COUNTY RD 22

TOWNSHIP RD 79

COUNTY RD 55

TOWNSHIP ROAD 240

TOWNSHIP RD 83

COUNTY ROAD 5

COUNTY RD 32

TOWNSHIP RD 165

COUNTY RD 43

S.R.258

COUNTY RD 51

TOWNSHIP ROAD 238

US 22

SR 800

TOWNSHIP RD 101

US 250

TOWNSHIP RD 277

SR 151

TUNNEL HILL ROAD

TOWNSHIP RD 76

US 250

SR 151

COUNTY RD 41

TOWNSHIP RD 78

COUNTY RD 41

COUNTY RD 15

TOWNSHIP RD 237

COUNTY RD 8

COUNTY RD 4

TOWNSHIP RD 269

COUNTY RD 16

EASTPORT RD MR161

COUNTY RD 15

COUNTY RD 1

TWP RD 123

Arbaugh Rd

COUNTY RD 6

TWP ROAD 106

S CADIZ STREET

US 250

SR 151

COUNTY RD 50

U.S.22

US 22

U.S.22 WB

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