County profile · official public datasets

Grant County, IN

280 public highway bridges tracked in the FHWA National Bridge Inventory: 38.6% rated Good, 59.6% Fair, 1.8% Poor.

280
Public bridges: 38.6%
Good condition: 1.8%
Poor condition

The verdict

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

Grant County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 14%
lowest Poor share in state: 1.8%
Poor-condition share: 280
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.

Grant County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grant County ranks #13 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.8%). Grant County, Indiana contains 280 public highway bridges. Roughly 38.6% are rated “Good,” 59.6% “Fair,” and 1.8% “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

280

Public highway bridges in Grant County

Good condition

38.6%

108 of 280 rated 7-9

Fair condition

59.6%

167 of 280 rated 5-6

Poor condition

1.8%

5 of 280 rated 4 or below

In-state Poor-share rank

#13 of 92

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

Condition distribution

Share of 280 NBI-tracked bridges by lowest applicable component rating.

Good

38.6% (108)

Fair

59.6% (167)

Poor

1.8% (5)

Grant County's Poor-condition bridges carry 8,070 vehicle crossings a day

That is 0.8% of the county's reported daily bridge traffic on 1.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,614 crossings a day against 4,060 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 280 of 280 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

47.5% of Grant County's bridges have passed the 50-year mark

133 of the 280 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 38.6% 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 92.4% of the county's Poor-condition bridge traffic

BRANSON ST over MISSISSINEWA RIVER, built 1910, carries 7,460 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 8,070 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1910s

2
1920s

10
1930s

15
1940s

10
1950s

25
1960s

57
1970s

31
1980s

29
1990s

52
2000s

30
2010s

9
2020s

9

What this shows Construction peaked in the 1960s, when 57 of the county's bridges still in the inventory were built, which is 20.4% 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 Indiana average (1978).

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

The 5 Indiana counties nearest Grant County in number of bridges, with their condition splits. Its 1.8% Poor share is the 1st-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1975 is in line with the group.

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

Bridge inventory size and condition shares for Grant County and the 5 Indiana counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Knox County	290	40%	55.2%	4.8%	1976
Grant County (this page)	280	38.6%	59.6%	1.8%	1975
Vanderburgh County	279	47.7%	48%	4.3%	1980
Elkhart County	278	38.1%	55.8%	6.1%	1975
Delaware County	277	31.8%	62.8%	5.4%	1976
Porter County	277	42.6%	52%	5.4%	1970

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

Similar inventory size

Nearest county inventories outside IN (280 bridges here).

Limestone County, TX · 280 bridges
Rusk County, TX · 280 bridges
Smith County, KS · 281 bridges
Logan County, OH · 281 bridges

Similar average build year

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

San Bernardino County, CA · avg 1975 · 1,422 bridges
Lane County, OR · avg 1975 · 1,010 bridges
Fulton County, GA · avg 1975 · 775 bridges
Westmoreland County, PA · avg 1975 · 620 bridges

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

All 280 Good 108 Fair 167 Poor 5

Good-condition bridges (108)

Sort:

Grant County Bridge Snapshot

Condition distribution

Grant County's Poor-condition bridges carry 8,070 vehicle crossings a day

47.5% of Grant County's bridges have passed the 50-year mark

One structure carries 92.4% of the county's Poor-condition bridge traffic

How Grant 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 (108)

SR 9

SR 18 WB

I-69 SB

I-69 NB

OLD SR 18

6TH ST

SR 37

CR S 900 W

CR 1100E

I-69 NB

I-69 NB

I-69 SB

I-69 SB

CR 600N

CR 1125S

CR 950S

CR 900W

EASTRIDGE DR

CR 1000E

CR 200W

MERIDIAN RD

SR 9

2ND ST

3RD ST

CR 650S

MILLER AVE

CR 1150E

CR 200N

CR 600E

CR 300S

SR 5

CR 400E

CR 400W

I-69 NB

10TH ST

SR 26

SR 13

I-69 NB

I-69 SB

CR 700E

CR 500E

CR 100N

SR 18

STONE RD

CR 300E

CR 400N

OLD SR 221/CR 950

SR 18

I-69 NB

I-69 SB

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