County profile · official public datasets

Warren County, OH

336 public highway bridges tracked in the FHWA National Bridge Inventory: 58.6% rated Good, 36% Fair, 5.4% Poor.

336
Public bridges: 58.6%
Good condition: 5.4%
Poor condition

The verdict

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

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

53rd
of 88 on Poor share: 5.4%
Poor-condition share: 336
public highway bridges: 1981
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.

Warren County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Warren County ranks #53 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.4%). Warren County, Ohio contains 336 public highway bridges. Roughly 58.6% are rated “Good,” 36% “Fair,” and 5.4% “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

336

Public highway bridges in Warren County

Good condition

58.6%

197 of 336 rated 7-9

Fair condition

36%

121 of 336 rated 5-6

Poor condition

5.4%

18 of 336 rated 4 or below

In-state Poor-share rank

#53 of 88

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

Condition distribution

Share of 336 NBI-tracked bridges by lowest applicable component rating.

Good

58.6% (197)

Fair

36% (121)

Poor

5.4% (18)

Warren County's Poor-condition bridges carry 42,688 vehicle crossings a day

That is 1.5% of the county's reported daily bridge traffic on 5.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,372 crossings a day against 9,618 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 336 of 336 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

39.9% of Warren County's bridges have passed the 50-year mark

134 of the 336 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 58.6% 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 38.5% of the county's Poor-condition bridge traffic

US 22 over BEAR RUN, built 1938, carries 16,452 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 18-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 42,688 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

1
1920s

3
1930s

10
1940s

4
1950s

13
1960s

62
1970s

70
1980s

56
1990s

60
2000s

27
2010s

27
2020s

2

What this shows Construction peaked in the 1970s, when 70 of the county's bridges still in the inventory were built, which is 20.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1981) matches the Ohio average (1977).

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

The 5 Ohio counties nearest Warren County in number of bridges, with their condition splits. Its 5.4% Poor share is the 6th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1977 is in line with the group.

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

Bridge inventory size and condition shares for Warren County and the 5 Ohio counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Mahoning County	348	56.6%	38.5%	4.9%	1967
Greene County	344	67.4%	29.7%	2.9%	1977
Clark County	340	73.8%	26.2%	0%	1973
Tuscarawas County	336	66.7%	31%	2.4%	1981
Warren County (this page)	336	58.6%	36%	5.4%	1981
Mercer County	329	41.3%	55.9%	2.7%	1989

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

Similar inventory size

Nearest county inventories outside OH (336 bridges here).

Jefferson County, AR · 336 bridges
Kane County, IL · 336 bridges
Charleston County, SC · 336 bridges
Fayette County, TN · 336 bridges

Similar average build year

Nearest mean year-built outside OH (1981 here).

Greenville County, SC · avg 1981 · 635 bridges
McLean County, IL · avg 1981 · 624 bridges
Shawnee County, KS · avg 1981 · 563 bridges
Pottawattamie County, IA · avg 1981 · 557 bridges

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

All 336 Good 197 Fair 121 Poor 18

Good-condition bridges (197)

Sort:

Warren County Bridge Snapshot

Condition distribution

Warren County's Poor-condition bridges carry 42,688 vehicle crossings a day

39.9% of Warren County's bridges have passed the 50-year mark

One structure carries 38.5% of the county's Poor-condition bridge traffic

How Warren 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 (197)

KINGS MILLS RD.

BREWER ROAD

COUNTY BROOK COURT

Townsley Drive

Everett Avenue

WEST STREET

MASON-MORROW-MILLG

HALLSCREEK ROAD

AUTUM RIDGE DRIVE

S WEST STREET

I-71 SB

HUMMINGBIRD DR.

SB SR 48F

FAIRVIEW DR

NB SR 48F

WATKINS GLEN ROAD

SR 63

SB IR 71

WILMINGTON RD C7

US42

SB IR 71

SR 73

IR 75

SR 123

WILMINGTON ROAD

OREGONIA ROAD

HAMILTON ROAD

LEBANON ROAD

MORROW-WOODVILLE

New Burlington Rd

MORROW-BLACKHAWK

MIDDLEBORO ROAD

CORWIN ROAD

Hendrickson Road

US 22

US 42

TRADEWIND DRIVE

TURTLECREEK UNION

SR 48

N GARVER ROAD

SR 122

W MULBERRY STREET

IR 71

IR71

SR 73

Wilmington Road

OREGONIA RD.

LOWER SPRINGBORO R

MIDDLETOWN ROAD

Union Road

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