County profile · official public datasets

Montgomery County, IN

252 public highway bridges tracked in the FHWA National Bridge Inventory: 51.2% rated Good, 46.4% Fair, 2.4% Poor.

252
Public bridges: 51.2%
Good condition: 2.4%
Poor condition

The verdict

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

Montgomery County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 23%
lowest Poor share in state: 2.4%
Poor-condition share: 252
public highway bridges: 1983
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 #21 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.4%). Montgomery County, Indiana contains 252 public highway bridges. Roughly 51.2% are rated “Good,” 46.4% “Fair,” and 2.4% “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

252

Public highway bridges in Montgomery County

Good condition

51.2%

129 of 252 rated 7-9

Fair condition

46.4%

117 of 252 rated 5-6

Poor condition

2.4%

6 of 252 rated 4 or below

In-state Poor-share rank

#21 of 92

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

Condition distribution

Share of 252 NBI-tracked bridges by lowest applicable component rating.

Good

51.2% (129)

Fair

46.4% (117)

Poor

2.4% (6)

Montgomery County's Poor-condition bridges carry 6,166 vehicle crossings a day

That is 1.1% of the county's reported daily bridge traffic on 2.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,028 crossings a day against 1,987 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 252 of 252 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

31.7% of Montgomery County's bridges have passed the 50-year mark

80 of the 252 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 51.2% 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 57.7% of the county's Poor-condition bridge traffic

SR 32 over MILL CREEK, built 1920, carries 3,556 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 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 6,166 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

3
1930s

9
1940s

5
1950s

9
1960s

40
1970s

27
1980s

52
1990s

57
2000s

39
2010s

8
2020s

3

What this shows Construction peaked in the 1990s, when 57 of the county's bridges still in the inventory were built, which is 22.6% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1983, 5 years newer than the Indiana average of 1978.

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

The 5 Indiana counties nearest Montgomery County in number of bridges, with their condition splits. Its 2.4% Poor share is the 3rd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1981 is in line with the group.

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

Bridge inventory size and condition shares for Montgomery County and the 5 Indiana counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Clark County	257	52.5%	45.9%	1.6%	1987
Randolph County	257	38.1%	53.3%	8.6%	1978
Morgan County	252	50.4%	45.6%	4%	1986
Montgomery County (this page)	252	51.2%	46.4%	2.4%	1983
Shelby County	247	32.4%	60.3%	7.3%	1974
Spencer County	244	48.8%	50%	1.2%	1982

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 Indiana so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IN (252 bridges here).

Harlan County, KY · 252 bridges
Oxford County, ME · 252 bridges
Colfax County, NE · 252 bridges
Medina County, OH · 252 bridges

Similar average build year

Nearest mean year-built outside IN (1983 here).

Dallas County, TX · avg 1983 · 3,230 bridges
Bexar County, TX · avg 1983 · 2,342 bridges
Sedgwick County, KS · avg 1983 · 1,333 bridges
Will County, IL · avg 1983 · 649 bridges

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

All 252 Good 129 Fair 117 Poor 6

Good-condition bridges (129)

Sort:

Montgomery County Bridge Snapshot

Condition distribution

Montgomery County's Poor-condition bridges carry 6,166 vehicle crossings a day

31.7% of Montgomery County's bridges have passed the 50-year mark

One structure carries 57.7% of the county's Poor-condition bridge traffic

How Montgomery 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 (129)

CR 650W

INDIAN CREEK RD

CR 475W

CR 475S

CR 950 E

CHESTNUT ST

JOHN ST

VINE ST

BLACK CR VALLEY RD

LAFAYETTE AVE

CHESTNUT ST

CR 875E

CR 650N

LADOGA RD

MAIN ST

CR 950E

CR 400N

CR 225W

I-74 EB

MILL ST

SR 59

CR 1000E

CR 900S

I-74 WB

CR 1075E

SR 234

CR 200S

CR 1200S

I-74 WB

CR 225W

CR 1000S

CR 950S

CR 950S

CR 550E

E COUNTY LINE RD

CR 100W

CR 500S

CR 500E

US 231

I-74 EB

I-74 EB

I-74 EB

US 136

US 136

CR 225W

SR 32

CR 150S

US 231

CR 550E

CR 500N

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