Total bridges
130
Public highway bridges in Lafourche County
County profile · official public datasets
Lafourche County, LA
130 public highway bridges tracked in the FHWA National Bridge Inventory: 39.2% rated Good, 44.6% Fair, 16.2% Poor.
- 130
- Public bridges
- 39.2%
- Good condition
- 16.2%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Lafourche County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 50th
- of 64 on Poor share
- 16.2%
- Poor-condition share
- 130
- public highway bridges
- 1981
- 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.
Lafourche County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Lafourche County ranks #50 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 16.2%). Lafourche County, Louisiana contains 130 public highway bridges. Roughly 39.2% are rated “Good,” 44.6% “Fair,” and 16.2% “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
39.2%
51 of 130 rated 7-9
Fair condition
44.6%
58 of 130 rated 5-6
Poor condition
16.2%
21 of 130 rated 4 or below
In-state Poor-share rank
#50 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 130 NBI-tracked bridges by lowest applicable component rating.
Good 39.2% (51)
Fair 44.6% (58)
Poor 16.2% (21)
Lafourche County's Poor-condition bridges carry 104,113 vehicle crossings a day
That is 11.6% of the county's reported daily bridge traffic on 14.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 5,480 crossings a day against 6,764 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 128 of 130 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.1% of Lafourche County's bridges have passed the 50-year mark
43 of the 130 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 39.2% 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 19.3% of the county's Poor-condition bridge traffic
LA0020 over DRAINAGE CANAL, built 1968, carries 20,091 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 21-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 104,113 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Lafourche County's bridges were built
130 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s 9
1950–1959
9 bridges
- 1960s
1960–1969
22 bridges
- 1970s
1970–1979
31 bridges
- 1980s
1980–1989
29 bridges
- 1990s
1990–1999
16 bridges
- 2000s 10
2000–2009
10 bridges
- 2010s 11
2010–2019
11 bridges
What this shows Construction peaked in the 1970s, when 31 of the county's bridges still in the inventory were built, which is 23.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1981) matches the Louisiana average (1982).
How Lafourche County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Lafourche County in number of bridges, with their condition splits. Its 16.2% Poor share is the 5th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1982 is in line with the group.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Morehouse County | 136 | 33.8% | 52.9% | 13.2% | 1983 |
| East Feliciana County | 133 | 32.3% | 42.1% | 25.6% | 1980 |
| Franklin County | 131 | 64.9% | 32.1% | 3.1% | 1989 |
| Lafourche County (this page) | 130 | 39.2% | 44.6% | 16.2% | 1981 |
| Caldwell County | 124 | 57.3% | 34.7% | 8.1% | 1982 |
| St. Mary County | 124 | 31.5% | 62.1% | 6.5% | 1975 |
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 Lafourche 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 Lafourche County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (130 bridges here).
- Kit Carson County, CO · 130 bridges
- Bay County, FL · 130 bridges
- Lowndes County, GA · 130 bridges
- Whitfield County, GA · 130 bridges
Similar average build year
Nearest mean year-built outside LA (1981 here).
- Franklin County, OH · avg 1981 · 922 bridges
- Greenville County, SC · avg 1981 · 635 bridges
- Montgomery County, OH · avg 1981 · 632 bridges
- McLean County, IL · avg 1981 · 624 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (130)
LA0309
GoodOver: BUBBLING BAYOU
2.5 MI NORTH OF US 90, Lafourche, LA
Built 1995 Load: 43.5 t ADT: 4,583
LA0309
GoodOver: PHILLIPS CANAL
4.0 MI NORTH OF US 90, Lafourche, LA
Built 1994 Load: 43.5 t ADT: 4,583
US0090
GoodOver: MCMAHON CANAL
.7 MI EAST OF LA 182, Lafourche, LA
Built 1984 Load: 43.5 t ADT: 189
LA0001
GoodOver: BAYOU THUNDER
6.2 MI E OF LA 3090, Lafourche, LA
Built 2019 Load: 43.7 t ADT: 3,305
LA0001
GoodOver: BAYOU FERBLANC
5.7 MI E OF LA 3090, Lafourche, LA
Built 2019 Load: 43.7 t ADT: 3,305
LA0308
GoodOver: DRAINAGE CANAL
1.2 MI. NW. OF US90, Lafourche, LA
Built 2018 Load: 55.1 t ADT: 4,131
US0090
GoodOver: BAYOU BLUE
1.2 MILES NORTH OF US 90, Lafourche, LA
Built 1995 Load: 74.5 t ADT: 12,192
US0090
GoodOver: BAYOU BLUE
1.2 MILES SOUTH OF US 90, Lafourche, LA
Built 1995 Load: 74.5 t ADT: 12,192
LA0001
GoodOver: MARSH
LA 1 1.5 MILES SOUTH OF B, Lafourche, LA
Built 2009 Load: 76.5 t ADT: 1,060
Avenue E
PoorOver: DRESSER CANAL
0.10 MI WEST OF LA 1, Lafourche, LA
Built 1952 Load: 0.0 t
VALENTINE BRIDGE R
PoorOver: LAFOURCHE BAYOU
0.01 MI N OF LA 1, Lafourche, LA
Built 1969 Load: 0.0 t
LA0308
PoorOver: BAYOU LAFOURCHE
.01 MI NORTH OF LA 1, Lafourche, LA
Built 1970 Load: 1.0 t ADT: 5,198
HAMILTON ST
PoorOver: FORTY ARPENT CANAL
1.3 MI N. OF LA 308, Lafourche, LA
Built 1960 Load: 10.0 t ADT: 204
Oak Ridge Park Rd
PoorOver: CANAL
0.5M WEST OF LA 1, Lafourche, LA
Built 1981 Load: 11.3 t ADT: 81
LA0308
PoorOver: SCULLY CANAL
.6 MI SOUTH OF LA 308 SPU, Lafourche, LA
Built 1954 Load: 12.0 t ADT: 5,198
LA0316
PoorOver: ST LOUIS CANAL
1.8 MI NORTH OF LA 182, Lafourche, LA
Built 1972 Load: 13.3 t ADT: 1,292
LA0648
PoorOver: DRAIN CANAL
.62 MI EAST OF LA 648, Lafourche, LA
Built 1959 Load: 13.3 t ADT: 9,183
LA0308
PoorOver: VALENTINE CANAL
6.3 MI NORTH OF LA 657, Lafourche, LA
Built 1964 Load: 13.6 t ADT: 8,181
LA0308
PoorOver: LEBRETON CANAL
.5 MI SOUTH OF LA 3162, Lafourche, LA
Built 1963 Load: 14.3 t ADT: 5,198
LA0655
PoorOver: BAYOU LAFOURCHE
.79 MI EAST OF LA 1, Lafourche, LA
Built 1940 Load: 15.6 t ADT: 2,380
LA0020
PoorOver: DRAINAGE CANAL
5.0 MI NORTH OF LA 308, Lafourche, LA
Built 1968 Load: 16.2 t ADT: 20,091
LA0308
PoorOver: DRAINAGE CANAL
.5 MI SOUTH OF LA 655, Lafourche, LA
Built 1965 Load: 16.2 t ADT: 11,623
Sanchez Rd
PoorOver: GRAND BAYOU
0065 LOG MI FROM INT, Lafourche, LA
Built 1955 Load: 16.8 t ADT: 901
LA0653
PoorOver: BAYOU DUMAR
3.7 MI EAST OF LA 182, Lafourche, LA
Built 1960 Load: 18.1 t ADT: 273
Lefort Bypass
PoorOver: CUT OFF BAYOU
0136 LOG MI FROM INT, Lafourche, LA
Built 1971 Load: 18.5 t ADT: 2,222
LA0001
PoorOver: CO CANAL LOCKPORT
.1 MI NORTH OF LA 655, Lafourche, LA
Built 1959 Load: 20.4 t ADT: 9,831
LA3087
PoorOver: HOLLYWOOD CANAL
1.20 MI S. OF JCT US90, Lafourche, LA
Built 1988 Load: 21.4 t ADT: 13,617
LA3087
PoorOver: HOLLYWOOD CANAL
1.20 MI S OF JCT US90, Lafourche, LA
Built 1988 Load: 21.4 t ADT: 8,036
CYPRESS AVE
PoorOver: BAYOU POINTE AU CHENE
3.55 MI FROM LA 55, Lafourche, LA
Built 1987 Load: 23.7 t ADT: 193
MARY BETH AVE
PoorOver: HOLLYWOOD CANAL
0.6 MI N. OF LA 316, Lafourche, LA
Built 1968 Load: 36.9 t ADT: 411
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.