County profile · official public datasets

Montgomery County, OH

632 public highway bridges tracked in the FHWA National Bridge Inventory: 67.2% rated Good, 30.1% Fair, 2.7% Poor.

632
Public bridges: 67.2%
Good condition: 2.7%
Poor condition

The verdict

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

Montgomery County posts a better-than-median Poor-condition share among rated counties in the state across large county bridge inventory.

Top 36%
lowest Poor share in state: 2.7%
Poor-condition share: 632
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.

Montgomery County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Montgomery County ranks #32 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.7%). Montgomery County, Ohio contains 632 public highway bridges. Roughly 67.2% are rated “Good,” 30.1% “Fair,” and 2.7% “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

632

Public highway bridges in Montgomery County

Good condition

67.2%

425 of 632 rated 7-9

Fair condition

30.1%

190 of 632 rated 5-6

Poor condition

2.7%

17 of 632 rated 4 or below

In-state Poor-share rank

#32 of 88

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

Condition distribution

Share of 632 NBI-tracked bridges by lowest applicable component rating.

Good

67.2% (425)

Fair

30.1% (190)

Poor

2.7% (17)

Montgomery County's Poor-condition bridges carry 78,946 vehicle crossings a day

That is 0.7% of the county's reported daily bridge traffic on 2.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 4,644 crossings a day against 19,500 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 632 of 632 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

41.8% of Montgomery County's bridges have passed the 50-year mark

264 of the 632 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 67.2% 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 34.2% of the county's Poor-condition bridge traffic

Shoup Mill Rd. over storm sewer, built 1968, carries 26,981 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 78,946 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

7
1910s

3
1920s

2
1930s

7
1940s

7
1950s

48
1960s

144
1970s

65
1980s

127
1990s

84
2000s

76
2010s

55
2020s

7

What this shows Construction peaked in the 1960s, when 144 of the county's bridges still in the inventory were built, which is 22.8% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1981) matches the Ohio average (1977).

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

The 5 Ohio counties nearest Montgomery County in number of bridges, with their condition splits. Its 2.7% Poor share is the 3rd-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1979 is in line with the group.

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

Bridge inventory size and condition shares for Montgomery County and the 5 Ohio counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Hamilton County	783	57.5%	39.6%	2.9%	1970
Montgomery County (this page)	632	67.2%	30.1%	2.7%	1981
Summit County	563	55.4%	42.3%	2.3%	1974
Wood County	508	64.2%	31.5%	4.3%	1980
Darke County	463	82.9%	16.6%	0.4%	1985
Licking County	439	57.2%	35.1%	7.7%	1988

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

Similar inventory size

Nearest county inventories outside OH (632 bridges here).

Greenville County, SC · 635 bridges
Steuben County, NY · 627 bridges
Spartanburg County, SC · 638 bridges
McLean County, IL · 624 bridges

Similar average build year

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

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 632 Good 425 Fair 190 Poor 17

Good-condition bridges (425)

Sort:

Montgomery County Bridge Snapshot

Condition distribution

Montgomery County's Poor-condition bridges carry 78,946 vehicle crossings a day

41.8% of Montgomery County's bridges have passed the 50-year mark

One structure carries 34.2% of the county's Poor-condition bridge traffic

How Montgomery 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 (425)

RMP I75N TO US35W

RAMP WB35 TO SB75

RAMP EB35 TO NB75

SR 4

I-75 RAMP D4

IR 75

IR-75

RAMP C OVR I75 I70

SR-725

SR725

SR741

IR-75

SB IR675

NB IR675

USR-35

Manning Road C0064

Lyons Road C0150

Alex Bell Rd C0078

Crawford-Toms Run

Paragon Road T0145

ROOKS ROAD T083A

Nutt Road T0146

West Third Street

HELENA STREET

SHOUP MILL ROAD

SCHANTZ AVENUE

DELCO PK ENTRY RD

Dayton Cincinnati

Broadway St M0125

South Dixie Dr M99

WILLOW CREEK DRIVE

Gardendale M1521

Heincke Road M0153

Marshall Rd M0131

Westbrook Rd M0024

NB SR444

Blank Road T0104

Lutheran Chrc C019

ALEX BELLBROOK

SR4

SR725

MCCLURE ST.

WILLOW TREE LANE

Lower Miamisburg

Little Twin T0063

GOODLOW AVENUE

AIRPORT ACCESS

Baltimore-Phillips

Farmersville-W Car

AIRPORT ACCESS

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