Total bridges
104
Public highway bridges in Madison County
County profile · official public datasets
Madison County, LA
104 public highway bridges tracked in the FHWA National Bridge Inventory: 16.3% rated Good, 76.9% Fair, 6.7% Poor.
- 104
- Public bridges
- 16.3%
- Good condition
- 6.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Madison County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 20%
- lowest Poor share in state
- 6.7%
- Poor-condition share
- 104
- public highway bridges
- 1974
- 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.
Madison County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Madison County ranks #13 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.7%). Madison County, Louisiana contains 104 public highway bridges. Roughly 16.3% are rated “Good,” 76.9% “Fair,” and 6.7% “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
16.3%
17 of 104 rated 7-9
Fair condition
76.9%
80 of 104 rated 5-6
Poor condition
6.7%
7 of 104 rated 4 or below
In-state Poor-share rank
#13 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 104 NBI-tracked bridges by lowest applicable component rating.
Good 16.3% (17)
Fair 76.9% (80)
Poor 6.7% (7)
Madison County's Poor-condition bridges carry 3,783 vehicle crossings a day
That is 0.3% of the county's reported daily bridge traffic on 6.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 540 crossings a day against 1,989 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 103 of 104 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
39.4% of Madison County's bridges have passed the 50-year mark
41 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 16.3% 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 41.2% of the county's Poor-condition bridge traffic
US0080 over PANOLA BAYOU, built 1955, carries 1,558 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 7-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 3,783 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Madison County's bridges were built
104 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1930s 5
1930–1939
5 bridges
- 1950s 13
1950–1959
13 bridges
- 1960s 8
1960–1969
8 bridges
- 1970s
1970–1979
51 bridges
- 1980s 6
1980–1989
6 bridges
- 1990s 7
1990–1999
7 bridges
- 2000s 9
2000–2009
9 bridges
- 2010s 3
2010–2019
3 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1970s, when 51 of the county's bridges still in the inventory were built, which is 49% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1974, 8 years older than the Louisiana average of 1982.
How Madison County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Madison County in number of bridges, with their condition splits. Its 6.7% Poor share is the 1st-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1982 is 8 years older.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Caldwell County | 124 | 57.3% | 34.7% | 8.1% | 1982 |
| Union County | 121 | 21.5% | 66.9% | 11.6% | 1977 |
| St. Martin County | 116 | 37.9% | 53.4% | 8.6% | 1980 |
| West Feliciana County | 108 | 47.2% | 33.3% | 19.4% | 1991 |
| Madison County (this page) | 104 | 16.3% | 76.9% | 6.7% | 1974 |
| West Carroll County | 88 | 23.9% | 69.3% | 6.8% | 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 Madison 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 Madison County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (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 LA (1974 here).
- Knox County, TN · avg 1974 · 588 bridges
- Summit County, OH · avg 1974 · 563 bridges
- Onondaga County, NY · avg 1974 · 472 bridges
- Orange County, NY · avg 1974 · 472 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (80)
LA0602-2
FairOver: I-20
LA 602 OVER I-20, Madison, LA
Built 1975 Load: 35.4 t ADT: 424
LA0601
FairOver: BRUSHY BAYOU
.1 MI NOERTH OF I-20, Madison, LA
Built 1937 Load: 35.4 t ADT: 5,065
I0020
FairOver: OLD US 65; WALNUT BAYOU
.2 MI WEST OF US 65, Madison, LA
Built 1975 Load: 37.2 t ADT: 31,481
I0020
FairOver: OLD US 65; WALNUT BAYOU
.2 .1 MI EAST OF US 65, Madison, LA
Built 1975 Load: 37.2 t ADT: 31,481
LA0602-1
FairOver: LA 602 OVER I-20
LA 602 OVER I-20, Madison, LA
Built 1975 Load: 38.1 t ADT: 885
I0020
FairOver: TENSAS-RIVER
3.5 MI EAST OF LA 577, Madison, LA
Built 1975 Load: 38.1 t ADT: 31,481
I0020
FairOver: TENSAS-RIVER
3.5 MI EAST OF LA 577, Madison, LA
Built 1975 Load: 38.1 t ADT: 31,481
I0020
FairOver: TENSAS-RIVER
6.3 MI EAST OF LA 577, Madison, LA
Built 1975 Load: 38.1 t ADT: 31,481
I0020
FairOver: TENSAS-RIVER
6.3 MI EAST OF LA 577, Madison, LA
Built 1975 Load: 38.1 t ADT: 31,481
I0020
FairOver: BAYOU DESPAIR
6.0 MI WEST OF US 65, Madison, LA
Built 1975 Load: 38.1 t ADT: 155
LA0577
FairOver: DRAINAGE CANAL
4.9 MI NORTH OF LA 577, Madison, LA
Built 1972 Load: 39.0 t ADT: 125
I0020
FairOver: M. P. RR
.4 MI WEST OF US 65, Madison, LA
Built 1975 Load: 40.8 t ADT: 31,481
I0020
FairOver: JOES BAYOU LAKE
1.3 MI WEST OF LA 577, Madison, LA
Built 1971 Load: 42.6 t ADT: 31,481
I0020
FairOver: JOES BAYOU LAKE
1.3 MI WEST OF LA 577, Madison, LA
Built 1971 Load: 42.6 t ADT: 31,481
I0020
FairOver: BAYOU DESPAIR
6.0 MI WEST OF US 65, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: BAYOU DESPAIR
6.0 MI WEST OF US 65, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: LAKE ONE BAYOU
2.8 MI WEST OF US 65, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: LAKE ONE BAYOU
2.8 MI WEST OF US 65, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: PANOLA BAYOU
2.2 MI WEST OF US 65, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: PANOLA BAYOU
2.2 MI WEST OF US 65, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: WALNUT BAYOU
.01 MI WEST OF WEST INT O, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: WALNUT BAYOU
.01 MI WEST OF WEST INT O, Madison, LA
Built 1975 Load: 45.4 t ADT: 31,481
I0020
FairOver: DRAINAGE CANAL
1.3 MI EAST OF WEST INT O, Madison, LA
Built 1975 Load: 45.4 t ADT: 30,064
I0020
FairOver: DRAINAGE CANAL BRIDGE
1.3 MI EAST OF WEST INT O, Madison, LA
Built 1975 Load: 45.4 t ADT: 29,961
I0020
FairOver: CYPRESS BAYOU BRIDGE
.7 MI EAST OF EAST INT OF, Madison, LA
Built 1975 Load: 45.4 t ADT: 28,276
SILVER CROSS RD
FairOver: WALNUT BAYOU
0.08 MI SW of US 80, Madison, LA
Built 2007 Load: 45.7 t ADT: 60
I0020
FairOver: CYPRESS BAYOU BRIDGE
.7 MI EAST OF EAST INT OF, Madison, LA
Built 1975 Load: 46.3 t ADT: 28,276
I0020
FairOver: CANAL-M32
I0020, Madison, LA
Built 1975 Load: 57.7 t ADT: 31,481
US0080
FairOver: CREEK
6.15 MI E RICHLAND PAR LN, Madison, LA
Built 2003 Load: 74.5 t ADT: 1,181
E BEAR LAKE RD #1
FairOver: LITTLE TENSAS BAYOU
2.3 MI W of US 65, Madison, LA
Built 1994 Load: 74.5 t ADT: 220
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.