Total bridges
80
Public highway bridges in Iberville County
County profile · official public datasets
Iberville County, LA
80 public highway bridges tracked in the FHWA National Bridge Inventory: 33.8% rated Good, 51.3% Fair, 15% Poor.
- 80
- Public bridges
- 33.8%
- Good condition
- 15%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Iberville County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 46th
- of 64 on Poor share
- 15%
- Poor-condition share
- 80
- public highway bridges
- 1975
- 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.
Iberville County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Iberville County ranks #46 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15%). Iberville County, Louisiana contains 80 public highway bridges. Roughly 33.8% are rated “Good,” 51.3% “Fair,” and 15% “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
33.8%
27 of 80 rated 7-9
Fair condition
51.3%
41 of 80 rated 5-6
Poor condition
15%
12 of 80 rated 4 or below
In-state Poor-share rank
#46 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 80 NBI-tracked bridges by lowest applicable component rating.
Good 33.8% (27)
Fair 51.3% (41)
Poor 15% (12)
Iberville County's Poor-condition bridges carry 32,961 vehicle crossings a day
That is 5.2% of the county's reported daily bridge traffic on 15% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,747 crossings a day against 7,279 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 80 of 80 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
71.3% of Iberville County's bridges have passed the 50-year mark
57 of the 80 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 33.8% 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 32.9% of the county's Poor-condition bridge traffic
LA0001 over BAYOU PLAQUEMINE, built 1950, carries 10,843 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 12-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 32,961 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Iberville County's bridges were built
80 bridges with a recorded construction year, grouped by decade
- 1950s
1950–1959
12 bridges
- 1960s
1960–1969
18 bridges
- 1970s
1970–1979
29 bridges
- 1980s 6
1980–1989
6 bridges
- 1990s 5
1990–1999
5 bridges
- 2000s 3
2000–2009
3 bridges
- 2010s 7
2010–2019
7 bridges
What this shows Construction peaked in the 1970s, when 29 of the county's bridges still in the inventory were built, which is 36.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1975, 7 years older than the Louisiana average of 1982.
How Iberville County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Iberville County in number of bridges, with their condition splits. Its 15% Poor share is the 5th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1980 is 5 years older.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| West Carroll County | 88 | 23.9% | 69.3% | 6.8% | 1982 |
| St. Charles County | 82 | 59.8% | 39% | 1.2% | 1981 |
| Iberville County (this page) | 80 | 33.8% | 51.3% | 15% | 1975 |
| West Baton Rouge County | 73 | 32.9% | 52.1% | 15.1% | 1969 |
| Catahoula County | 70 | 45.7% | 45.7% | 8.6% | 1984 |
| Assumption County | 68 | 48.5% | 41.2% | 10.3% | 1984 |
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 Iberville 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 Iberville County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (80 bridges here).
- Moffat County, CO · 80 bridges
- Burke County, GA · 80 bridges
- Gooding County, ID · 80 bridges
- Madison County, ID · 80 bridges
Similar average build year
Nearest mean year-built outside LA (1975 here).
- San Bernardino County, CA · avg 1975 · 1,422 bridges
- Lane County, OR · avg 1975 · 1,010 bridges
- Fulton County, GA · avg 1975 · 775 bridges
- Westmoreland County, PA · avg 1975 · 620 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (41)
LA0404
FairOver: BAYOU DANIEL
4.1 Mi. E of LA 75, Iberville, LA
Built 1955 Load: 4.5 t ADT: 551
LA0075-S
FairOver: UPPER GRAND R/B SORREL
LA0075, Iberville, LA
Built 1965 Load: 12.3 t ADT: 514
Bayou Paul Rd
FairOver: BAYOU PAUL
4.1 MI.NE OF ST.GABR, Iberville, LA
Built 1972 Load: 14.3 t ADT: 160
LA0404
FairOver: LEVY CANAL
0.52 M SW of LA 404&LA 69, Iberville, LA
Built 1962 Load: 15.6 t ADT: 551
Centerville Rd
FairOver: DRAINAGE BAYOU
0.5 Mi N of LA 76, Iberville, LA
Built 1970 Load: 15.9 t ADT: 110
Gracie St
FairOver: LEVEE BORROW PIT
.01 Mi. E of B. Sorrel Rd, Iberville, LA
Built 1995 Load: 18.5 t ADT: 100
LA0069
FairOver: MUDDY BAYOU
2.2 Mi N of LA 996, Iberville, LA
Built 1962 Load: 18.8 t ADT: 3,301
I0010
FairOver: UP Railroad
3.8 M W of LA 3000, Iberville, LA
Built 1972 Load: 20.1 t ADT: 58,734
I0010
FairOver: UP Railroad
I0010, Iberville, LA
Built 1972 Load: 20.1 t ADT: 298
BY GROSSE TETE XNG
FairOver: BAYOU GROSSE TETE
0.01 MI. W OF LA 411, Iberville, LA
Built 1967 Load: 20.1 t ADT: 960
LA0074
FairOver: BAYOU BREAUX
0.25 M NW LA 74&LA 3115, Iberville, LA
Built 1955 Load: 20.9 t ADT: 5,692
LA0996
FairOver: GRAND BAYOU
2.7 M N of LA 70, Iberville, LA
Built 1973 Load: 24.0 t ADT: 524
I0010
FairOver: BRIDGE 251 FR.RD
1.4 M E of LA 77, Iberville, LA
Built 1974 Load: 24.3 t ADT: 752
LA0404
FairOver: BAYOU BLACK
0.17 M W LA 404&LA 3001, Iberville, LA
Built 1970 Load: 26.6 t ADT: 551
Hurdle Rd
FairOver: BAYOU MARINGOUIN
JUNCTION LA 76, Iberville, LA
Built 1984 Load: 26.9 t ADT: 50
LA0077
FairOver: RICHARD BAYOU
LA0077, Iberville, LA
Built 1968 Load: 29.0 t ADT: 4,376
W Oak Ln
FairOver: BAYOU MARINGOUIN
0.9M SOUTH OF RAMAH, Iberville, LA
Built 1992 Load: 29.5 t ADT: 130
LA0076
FairOver: BAYOU GROSSE TETE
LA0076, Iberville, LA
Built 1973 Load: 30.1 t ADT: 7,562
I0010
FairOver: BAYOU GROSSE TETE
I0010, Iberville, LA
Built 1972 Load: 31.8 t ADT: 557
I0010
FairOver: BAYOU GROSSE TETE
77 FT E OF LA 77, Iberville, LA
Built 1972 Load: 31.8 t ADT: 557
LA0076
FairOver: W-8 MAIN CANAL
0.44 M NE of LA 76&LA 411, Iberville, LA
Built 1952 Load: 32.4 t ADT: 7,562
LA0076
FairOver: NO NAME
1.2 M NE of LA 76&LA 411, Iberville, LA
Built 1952 Load: 32.4 t ADT: 7,562
LA0030
FairOver: BAYOU MANCHAC
2.4 M S of LA 327&LA 30, Iberville, LA
Built 1967 Load: 32.4 t ADT: 17,089
I0010
FairOver: TRINITY DRAINAGE CANAL
I0010, Iberville, LA
Built 1971 Load: 33.0 t ADT: 58,734
I0010
FairOver: TRINITY DRAINAGE CANAL
I0010, Iberville, LA
Built 1971 Load: 33.0 t ADT: 298
I0010
FairOver: WHISKEY BAY CHANNEL
I0010, Iberville, LA
Built 1972 Load: 33.6 t ADT: 42,449
I0010
FairOver: I-10 RAMP
0.2 M E of LA 975, Iberville, LA
Built 1972 Load: 33.6 t ADT: 557
I0010
FairOver: LA 77 LA 411 BAYOU
I0010, Iberville, LA
Built 1972 Load: 33.6 t ADT: 58,734
I0010
FairOver: LA 77 LA 411 BAYOU
I0010, Iberville, LA
Built 1972 Load: 33.6 t ADT: 41,644
LA3066-S
FairOver: PLAQUEMINE BAYOU/IND VIL
LA3066-S, Iberville, LA
Built 1971 Load: 35.4 t ADT: 2,287
I0010
FairOver: WEST FLOODWAY
0.53 M W of I-10&LA975, Iberville, LA
Built 1972 Load: 35.4 t ADT: 42,449
I0010
FairOver: LA975 E FLOODWAY LA3000
5.6 Mi E of La3177 Onramp, Iberville, LA
Built 1972 Load: 35.4 t ADT: 21,450
I0010
FairOver: EAST FLOODWAY
0.2 M W OF I-10&LA3000, Iberville, LA
Built 1972 Load: 35.4 t ADT: 1,585
I0010
FairOver: I-10 RAMP
0.1 M E of LA 975, Iberville, LA
Built 1972 Load: 37.2 t ADT: 557
LA0977
FairOver: B.GROSSE TETE
LA0977, Iberville, LA
Built 1980 Load: 39.0 t ADT: 1,132
I0010
FairOver: I-10 RAMP
0.3 M E of LA 975, Iberville, LA
Built 1972 Load: 39.0 t ADT: 668
LA0988
FairOver: DOW DRAINAGE
0.3 MI N OF LA 1148, Iberville, LA
Built 1958 Load: 39.9 t ADT: 2,205
LA0988
FairOver: BAYOU BOURBEU
0.6 MI N of LA 1148, Iberville, LA
Built 1958 Load: 39.9 t ADT: 2,205
I0010
FairOver: I-10 RAMP
0.3 M E of LA 975, Iberville, LA
Built 1972 Load: 40.8 t ADT: 108
Gracie Ln
FairOver: LEVEE BARROW PIT
0.9 MI NW OF LA 75, Iberville, LA
Built 2017 Load: 44.4 t ADT: 681
LA0077
FairOver: BAYOU MARINGOUIN
0.01 M NE of LA 76, Iberville, LA
Built 1964 Load: 74.5 t ADT: 4,376
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.