County profile · official public datasets

Clinton County, IN

210 public highway bridges tracked in the FHWA National Bridge Inventory: 32.4% rated Good, 62.4% Fair, 5.2% Poor.

210
Public bridges: 32.4%
Good condition: 5.2%
Poor condition

The verdict

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

Clinton 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.

53rd
of 92 on Poor share: 5.2%
Poor-condition share: 210
public highway bridges: 1971
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.

Clinton County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Clinton County ranks #53 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.2%). Clinton County, Indiana contains 210 public highway bridges. Roughly 32.4% are rated “Good,” 62.4% “Fair,” and 5.2% “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

210

Public highway bridges in Clinton County

Good condition

32.4%

68 of 210 rated 7-9

Fair condition

62.4%

131 of 210 rated 5-6

Poor condition

5.2%

11 of 210 rated 4 or below

In-state Poor-share rank

#53 of 92

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

Condition distribution

Share of 210 NBI-tracked bridges by lowest applicable component rating.

Good

32.4% (68)

Fair

62.4% (131)

Poor

5.2% (11)

Clinton County's Poor-condition bridges carry 5,754 vehicle crossings a day

That is 1.1% of the county's reported daily bridge traffic on 5.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 523 crossings a day against 2,666 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 210 of 210 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

51.9% of Clinton County's bridges have passed the 50-year mark

109 of the 210 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 32.4% 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 55.8% of the county's Poor-condition bridge traffic

CR 150 S (KELLEY) over PRAIRIE CREEK, built 1954, carries 3,209 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 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 5,754 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1920s

20
1930s

17
1940s

7
1950s

20
1960s

28
1970s

31
1980s

29
1990s

30
2000s

15
2010s

8
2020s

4

What this shows Construction peaked in the 1970s, when 31 of the county's bridges still in the inventory were built, which is 14.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1971, 7 years older than the Indiana average of 1978.

How Clinton County compares with Indiana's closest counties by inventory size

The 5 Indiana counties nearest Clinton County in number of bridges, with their condition splits. Its 5.2% Poor share is the 5th-lowest of these 6. Its average build year of 1971 against a peer-group mean of 1978 is 7 years older.

Showing the 5 closest of 91 Indiana counties eligible for comparison.

Bridge inventory size and condition shares for Clinton County and the 5 Indiana counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Sullivan County	217	29.5%	65.4%	5.1%	1966
White County	214	36%	60.3%	3.7%	1978
Clinton County (this page)	210	32.4%	62.4%	5.2%	1971
Posey County	208	47.1%	47.1%	5.8%	1982
Henry County	206	30.6%	65%	4.4%	1978
Hancock County	201	58.2%	41.8%	0%	1985

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

Similar inventory size

Nearest county inventories outside IN (210 bridges here).

Fulton County, IL · 210 bridges
Howard County, IA · 210 bridges
Montgomery County, IA · 210 bridges
Calloway County, KY · 210 bridges

Similar average build year

Nearest mean year-built outside IN (1971 here).

Wayne County, MI · avg 1971 · 1,026 bridges
Baltimore County, MD · avg 1971 · 783 bridges
Washington County, PA · avg 1971 · 655 bridges
Linn County, OR · avg 1971 · 566 bridges

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

All 210 Good 68 Fair 131 Poor 11

Good-condition bridges (68)

Sort:

Clinton County Bridge Snapshot

Condition distribution

Clinton County's Poor-condition bridges carry 5,754 vehicle crossings a day

51.9% of Clinton County's bridges have passed the 50-year mark

One structure carries 55.8% of the county's Poor-condition bridge traffic

How Clinton County compares with Indiana'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 (68)

SR 26

CLINTON ST

ARMSTRONG STREET

CR 600W

SR 29

SR 75

CR 700 NORTH

CR 200 WEST

CR 600 SOUTH

CR 900 W

CR 70E

SR 75

US 421

US 421

SR 28

CR 800 N

CR 1100 EAST

CR 310 NORTH

CR 600 WEST

CR 750 SOUTH

SR 28

SR 29

CR 200 NORTH

CR 530 EAST

CR 750 EAST

CR 000 N/S

CR 875 WEST

CR 200 NORTH

CR 530 EAST

CR 900 EAST

MICHIGANTOWN ROAD

CR 400 NORTH

CR 900 EAST

I-65

CLAY ST

SR 29

CR 600W

CR 100 EAST

CR 310 SOUTH

CR 750 SOUTH

CR 400 EAST

CR 575 WEST

CR 950 WEST

CR 500 W (GAS LINE

BUNNELL ROAD

CR 900 E

CR 1000 EAST

CR 500E

CR 550W

CR 580 W

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