County profile · official public datasets

Mahoning County, OH

348 public highway bridges tracked in the FHWA National Bridge Inventory: 56.6% rated Good, 38.5% Fair, 4.9% Poor.

348
Public bridges: 56.6%
Good condition: 4.9%
Poor condition

The verdict

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

Mahoning 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.

47th
of 88 on Poor share: 4.9%
Poor-condition share: 348
public highway bridges: 1967
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.

Mahoning County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Mahoning County ranks #47 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.9%). Mahoning County, Ohio contains 348 public highway bridges. Roughly 56.6% are rated “Good,” 38.5% “Fair,” and 4.9% “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

348

Public highway bridges in Mahoning County

Good condition

56.6%

197 of 348 rated 7-9

Fair condition

38.5%

134 of 348 rated 5-6

Poor condition

4.9%

17 of 348 rated 4 or below

In-state Poor-share rank

#47 of 88

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

Condition distribution

Share of 348 NBI-tracked bridges by lowest applicable component rating.

Good

56.6% (197)

Fair

38.5% (134)

Poor

4.9% (17)

Mahoning County's Poor-condition bridges carry 54,719 vehicle crossings a day

That is 1.8% of the county's reported daily bridge traffic on 4.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,219 crossings a day against 10,287 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 348 of 348 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

74.4% of Mahoning County's bridges have passed the 50-year mark

259 of the 348 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 56.6% 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 30% of the county's Poor-condition bridge traffic

WESTERN RESERVE over YELLOW CREEK, built 1939, carries 16,431 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 17-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 54,719 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

7
1910s

5
1920s

13
1930s

15
1940s

19
1950s

66
1960s

87
1970s

53
1980s

18
1990s

29
2000s

21
2010s

13
2020s

2

What this shows Construction peaked in the 1960s, when 87 of the county's bridges still in the inventory were built, which is 25% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1967, 10 years older than the Ohio average of 1977.

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

The 5 Ohio counties nearest Mahoning County in number of bridges, with their condition splits. Its 4.9% Poor share is the 3rd-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1975 is 8 years older.

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

Bridge inventory size and condition shares for Mahoning County and the 5 Ohio counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Richland County	356	65.2%	28.7%	6.2%	1984
Ross County	356	41.6%	50.6%	7.9%	1964
Guernsey County	350	41.7%	49.1%	9.1%	1975
Mahoning County (this page)	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

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

Similar inventory size

Nearest county inventories outside OH (348 bridges here).

Fillmore County, MN · 348 bridges
Cumberland County, NC · 348 bridges
Cumberland County, PA · 348 bridges
Pennington County, SD · 348 bridges

Similar average build year

Nearest mean year-built outside OH (1967 here).

Los Angeles County, CA · avg 1967 · 3,547 bridges
Allegheny County, PA · avg 1967 · 1,294 bridges
Sonoma County, CA · avg 1967 · 609 bridges
Merced County, CA · avg 1967 · 528 bridges

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

All 348 Good 197 Fair 134 Poor 17

All bridges (348)

Sort:

Mahoning County Bridge Snapshot

Condition distribution

Mahoning County's Poor-condition bridges carry 54,719 vehicle crossings a day

74.4% of Mahoning County's bridges have passed the 50-year mark

One structure carries 30% of the county's Poor-condition bridge traffic

How Mahoning 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

All bridges (348)

Seacrist Rd.

ALLIANCE-SEBRING

NORTH LIMA RD.

I.R. 680

TIPPECANOE RD.

LIPKEY RD

LEFFINGWELL ROAD

WALKER MILL DR.

GAULT RD.

GLADSTONE RD.

First St.

WESTERN RESERVE

VALLEY STREET

SR 711

HERBERT RD

SR 45

SR 170

Renkenberger Rd.

MAHONING AVE.

SPRING COMMON AVE

DEWEY AVE.

LEFFINGWELL RD.

BANDY RD.

SR 289

SR 534

LANTERMAN ROAD

RIDGE AVENUE

KIRK RD.

HELSEL RD.

COLUMBIANNA RD.

SPRINGFIELD RD.

COURTNEY RD.

COURTNEY RD.

TWELFTH ST.

LEFFINGWELL RD.

BEARS DEN DRIVE

MIDDLETOWN RD.

SR 11

US 62 & SR 625

I.R. 80

IR80

BAILEY ROAD CR 65

SOUTH AVENUE

SR 170

SR 193

US-422 OVER SR-193

US 224

US 422

I.R. 680

MAHONING AVENUE

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