Total bridges
104
Public highway bridges in Martin County
County profile · official public datasets
Martin County, IN
104 public highway bridges tracked in the FHWA National Bridge Inventory: 40.4% rated Good, 51.9% Fair, 7.7% Poor.
- 104
- Public bridges
- 40.4%
- Good condition
- 7.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Martin County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 73rd
- of 92 on Poor share
- 7.7%
- Poor-condition share
- 104
- public highway bridges
- 1977
- 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.
Martin County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Martin County ranks #73 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.7%). Martin County, Indiana contains 104 public highway bridges. Roughly 40.4% are rated “Good,” 51.9% “Fair,” and 7.7% “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
40.4%
42 of 104 rated 7-9
Fair condition
51.9%
54 of 104 rated 5-6
Poor condition
7.7%
8 of 104 rated 4 or below
In-state Poor-share rank
#73 of 92
Among Indiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 104 NBI-tracked bridges by lowest applicable component rating.
Good 40.4% (42)
Fair 51.9% (54)
Poor 7.7% (8)
Martin County's Poor-condition bridges carry 735 vehicle crossings a day
That is 0.6% of the county's reported daily bridge traffic on 7.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 92 crossings a day against 1,279 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 104 of 104 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.7% of Martin County's bridges have passed the 50-year mark
35 of the 104 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 40.4% 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 27.2% of the county's Poor-condition bridge traffic
ROUTE H-85 over TRIBUTARY/TURKEY CREEK, built 1942, carries 200 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 8-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 735 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Martin County's bridges were built
104 bridges with a recorded construction year, grouped by decade
- pre-1900 6
Built before 1900
6 bridges
- 1900s 3
1900–1909
3 bridges
- 1910s 3
1910–1919
3 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s
1930–1939
8 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 1
1950–1959
1 bridges
- 1960s 4
1960–1969
4 bridges
- 1970s 5
1970–1979
5 bridges
- 1980s
1980–1989
11 bridges
- 1990s
1990–1999
15 bridges
- 2000s
2000–2009
20 bridges
- 2010s
2010–2019
15 bridges
- 2020s 6
2020–2029
6 bridges
What this shows Construction peaked in the 2000s, when 20 of the county's bridges still in the inventory were built, which is 19.2% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1977) matches the Indiana average (1978).
How Martin County compares with Indiana's closest counties by inventory size
The 5 Indiana counties nearest Martin County in number of bridges, with their condition splits. Its 7.7% Poor share is the 4th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1976 is in line with the group.
Showing the 5 closest of 91 Indiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Brown County | 114 | 20.2% | 63.2% | 16.7% | 1964 |
| Tipton County | 113 | 42.5% | 55.8% | 1.8% | 1983 |
| Martin County (this page) | 104 | 40.4% | 51.9% | 7.7% | 1977 |
| Pulaski County | 102 | 34.3% | 62.7% | 2.9% | 1976 |
| Fayette County | 100 | 33% | 57% | 10% | 1981 |
| LaGrange County | 100 | 45% | 54% | 1% | 1974 |
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 Martin 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 Martin County, both outside Indiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IN (104 bridges here).
- Nassau County, FL · 104 bridges
- Brooks County, GA · 104 bridges
- Grady County, GA · 104 bridges
- Bonner County, ID · 104 bridges
Similar average build year
Nearest mean year-built outside IN (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (104)
FRIENDS CREEK ROAD
PoorOver: FRIENDS CREEK
0.58 N BROOKS BRIDGE ROAD, Martin, IN
Built 1910 Load: 13.2 t ADT: 52
DEEP CUT LAKE ROAD
PoorOver: BEAVER CREEK
0.16 S OF SR 650, Martin, IN
Built 1890 Load: 21.3 t ADT: 63
DEEP CUT LAKE ROAD
PoorOver: BEAVER CREEK
0.35 S OF SR 650, Martin, IN
Built 1890 Load: 25.3 t ADT: 100
ROUTE H-85
PoorOver: TRIBUTARY/TURKEY CREEK
0.5 KM N OF H-58, Martin, IN
Built 1942 Load: 99.9 t ADT: 200
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.