Total bridges
252
Public highway bridges in Montgomery County
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.
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.
When Montgomery County's bridges were built
252 bridges with a recorded construction year, grouped by decade
- 1920s 3
1920–1929
3 bridges
- 1930s 9
1930–1939
9 bridges
- 1940s 5
1940–1949
5 bridges
- 1950s 9
1950–1959
9 bridges
- 1960s
1960–1969
40 bridges
- 1970s
1970–1979
27 bridges
- 1980s
1980–1989
52 bridges
- 1990s
1990–1999
57 bridges
- 2000s
2000–2009
39 bridges
- 2010s 8
2010–2019
8 bridges
- 2020s 3
2020–2029
3 bridges
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.
| 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.
Poor-condition bridges (6)
SR 234
PoorOver: RACCOON CREEK
06.91 E US 231, Montgomery, IN
Built 1941 Load: 21.4 t ADT: 1,730
W FALL CREEK RD
PoorOver: BRANCH OF SUGAR CREEK
00.50 W of CR 525 W, Montgomery, IN
Built 1974 Load: 30.4 t ADT: 150
CR 700W
PoorOver: NORTH FORK OF COAL CREEK
00.70 S of CR 1125 N, Montgomery, IN
Built 1967 Load: 34.9 t ADT: 200
SR 32
PoorOver: MILL CREEK
03.70 W SR 47, Montgomery, IN
Built 1920 Load: 88.2 t ADT: 3,556
CR 750E
PoorOver: BRANCH OF RACCOON CREEK
00.20 S of CR 700 S, Montgomery, IN
Built 1996 Load: 90.7 t ADT: 70
SR 234
PoorOver: BR INDIAN CREEK
01.12 W SR 47, Montgomery, IN
Built 1990 Load: 97.2 t ADT: 460
Read our methodology - how this data is sourced, computed, and verified.
Related
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.