County profile · official public datasets

Marion County, OH

229 public highway bridges tracked in the FHWA National Bridge Inventory: 63.8% rated Good, 34.1% Fair, 2.2% Poor.

229
Public bridges
63.8%
Good condition
2.2%
Poor condition

The verdict

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

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

Top 26%
lowest Poor share in state
2.2%
Poor-condition share
229
public highway bridges
1975
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.

Marion County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Marion County ranks #23 of 88 Ohio counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.2%). Marion County, Ohio contains 229 public highway bridges. Roughly 63.8% are rated “Good,” 34.1% “Fair,” and 2.2% “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

229

Public highway bridges in Marion County

Good condition

63.8%

146 of 229 rated 7-9

Fair condition

34.1%

78 of 229 rated 5-6

Poor condition

2.2%

5 of 229 rated 4 or below

In-state Poor-share rank

#23 of 88

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

Condition distribution

Share of 229 NBI-tracked bridges by lowest applicable component rating.

Good
63.8% (146)
Fair
34.1% (78)
Poor
2.2% (5)

Marion County's Poor-condition bridges carry 1,904 vehicle crossings a day

That is 0.4% of the county's reported daily bridge traffic on 2.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 381 crossings a day against 2,519 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 229 of 229 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

48% of Marion County's bridges have passed the 50-year mark

110 of the 229 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 63.8% 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 36.7% of the county's Poor-condition bridge traffic

SR 37 over SCIOTO RIVER, built 1950, carries 699 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 5-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,904 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Marion County's bridges were built

229 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 63 of the county's bridges still in the inventory were built, which is 27.5% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1975) matches the Ohio average (1977).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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

The 5 Ohio counties nearest Marion County in number of bridges, with their condition splits. Its 2.2% Poor share is the 3rd-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1973 is in line with the group.

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

Bridge inventory size and condition shares for Marion County and the 5 Ohio counties closest to it in inventory size
County Bridges Poor
Wyandot County 236 1.7%
Marion County (this page) 229 2.2%
Jefferson County 226 8.4%
Erie County 225 0.4%
Pickaway County 224 2.2%
Brown County 223 3.1%

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

Similar inventory size

Nearest county inventories outside OH (229 bridges here).

Similar average build year

Nearest mean year-built outside OH (1975 here).

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

All 229 Good 146 Fair 78 Poor 5

All bridges (229)

TOWNSHIP ROAD 123

Good

Over: BR OVER OLENTANGY RIVER

.3 MI W OF CR 141, Marion, OH

Built 1994 Load: 48.6 t ADT: 435

COUNTY ROAD 162

Good

Over: BRIDGE OVER ROCK SWALE

0.1 MI S OF JCT SR 309, Marion, OH

Built 2010 Load: 48.6 t ADT: 1,744

COUNTY ROAD 175

Good

Over: BR OVER GRAVE CREEK

.3 MI E OF JCT CR 204, Marion, OH

Built 1980 Load: 48.6 t ADT: 2,413

TOWNSHIP ROAD 197

Good

Over: BRIDGE OVER OLENTNAGY RI

0.2 MI E.OF JCT TR196, Marion, OH

Built 1996 Load: 48.6 t ADT: 66

COUNTY ROAD 25

Good

Over: BR OVER PRAIRIE RUN

.4 MI N OF JCT SR 309, Marion, OH

Built 1900 Load: 51.8 t ADT: 145

COUNTY ROAD 156

Good

Over: BR OVER MCKIBBEN DITCH

.4 MI N OF JCT CR 148, Marion, OH

Built 1900 Load: 51.8 t ADT: 385

US 23

Good

Over: OVER SR98-0013

OVER SR98-0013, Marion, OH

Built 1965 Load: 52.2 t ADT: 11,517

SR 529

Good

Over: MCKIBBEN DITCH

3.15 MI E OF SR98, Marion, OH

Built 1979 Load: 53.1 t ADT: 2,976

COUNTY ROAD 136

Good

Over: BR OVER QUQUA DITCH

0.2 MI E OF JCT SR 423, Marion, OH

Built 1967 Load: 54.1 t ADT: 3,518

SR 4 NORTH

Good

Over: OVER CSX RR

8.17 MI N. OF SR203, Marion, OH

Built 1967 Load: 55.1 t ADT: 4,210

COUNTY ROAD 25D

Good

Over: BR OVER CARROLL DT

.4 MI. N. OF JCT CR 67, Marion, OH

Built 1941 Load: 55.1 t ADT: 145

COUNTY ROAD 126

Good

Over: BR OVER BATTLE RUN

1.2 MI N OF JCT SR 47, Marion, OH

Built 1967 Load: 55.1 t ADT: 954

COUNTY ROAD 213

Good

Over: BR OVER TYMOCHTEE

0.2 MI SW OF JCT SR 309, Marion, OH

Built 2011 Load: 58.3 t ADT: 43

US 23

Good

Over: OVER SR98-0011

OVER SR98-0011, Marion, OH

Built 1965 Load: 61.6 t ADT: 11,517

US23 SB

Good

Over: LITTLE SCIOTO RIVER

2.02 MI N OF SR4, Marion, OH

Built 1967 Load: 61.6 t ADT: 8,368

US23 NB

Good

Over: LITTLE SCIOTO RIVER

2.02 MI N OF SR4, Marion, OH

Built 1967 Load: 61.6 t ADT: 8,368

COUNTY ROAD 13

Good

Over: BR OVER SCIOTO

1.6 MI N OF JCT CR 12, Marion, OH

Built 2010 Load: 61.6 t ADT: 193

COUNTY ROAD 66G

Good

Over: BR OVER LITTLE SCIOTO

.6 MI E. OF JCT CR 94, Marion, OH

Built 1959 Load: 61.6 t ADT: 885

TOWNSHIP ROAD 27 A

Good

Over: BR OVER PAW PAW RUN

.4 MI E OF JCT SR 37, Marion, OH

Built 1991 Load: 61.6 t ADT: 153

US 23

Good

Over: CAUQUAW CR

0.2 MI N OF SR98, Marion, OH

Built 1965 Load: 62.5 t ADT: 11,517

TOWNSHIP ROAD 62A

Good

Over: BELL-HARRAMAN DITCH

.1MI S. OF JCT SR 309, Marion, OH

Built 2001 Load: 64.8 t ADT: 324

US 23

Good

Over: CAUQUAW CR

0.2 MI N OF SR98, Marion, OH

Built 1965 Load: 65.8 t ADT: 11,517

COUNTY ROAD 095B

Good

Over: BRIDGE OVER ROCK SWALE

.2MI. W. OF JCT. TR. 096, Marion, OH

Built 1900 Load: 71.3 t ADT: 213

COUNTY ROAD 29

Good

Over: ENOCH CREEK

1 MI N OF JCT SR 309, Marion, OH

Built 1990 Load: 77.8 t ADT: 68

COUNTY ROAD 114I

Poor

Over: BR OVER FLAT RUN WEST

.2 MI E OF JCT TR195J, Marion, OH

Built 1955 Load: 7.3 t ADT: 58

SR 37

Poor

Over: SCIOTO RIVER

0.01 MI N OF S CORP LARUE, Marion, OH

Built 1950 Load: 18.8 t ADT: 699

COUNTY ROAD 026Y

Poor

Over: BR OVER FLAT RUN

0.8 MI E OF JCT SR100, Marion, OH

Built 1981 Load: 20.7 t ADT: 319

COUNTY ROAD 148

Poor

Over: BR OVER RIFFLE CREEK

.9 MI E OF JCT SR 98, Marion, OH

Built 1965 Load: 38.9 t ADT: 504

TOWNSHIP ROAD 160

Poor

Over: MC KIBBEN DITCH

.9 MI E OF JCT CR 156, Marion, OH

Built 1965 Load: 61.6 t ADT: 324

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.