Total bridges
379
Public highway bridges in Jefferson County
County profile · official public datasets
Jefferson County, LA
379 public highway bridges tracked in the FHWA National Bridge Inventory: 58.6% rated Good, 36.9% Fair, 4.5% Poor.
- 379
- Public bridges
- 58.6%
- Good condition
- 4.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Jefferson County posts a top-10% lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 8%
- lowest Poor share in state
- 4.5%
- Poor-condition share
- 379
- public highway bridges
- 1984
- 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.
Jefferson County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Jefferson County ranks #5 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.5%). Jefferson County, Louisiana contains 379 public highway bridges. Roughly 58.6% are rated “Good,” 36.9% “Fair,” and 4.5% “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
58.6%
222 of 379 rated 7-9
Fair condition
36.9%
140 of 379 rated 5-6
Poor condition
4.5%
17 of 379 rated 4 or below
In-state Poor-share rank
#5 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 379 NBI-tracked bridges by lowest applicable component rating.
Good 58.6% (222)
Fair 36.9% (140)
Poor 4.5% (17)
Jefferson County's Poor-condition bridges carry 278,108 vehicle crossings a day
That is 4.5% of the county's reported daily bridge traffic on 3.8% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 25,283 crossings a day against 19,771 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 293 of 379 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
35.4% of Jefferson County's bridges have passed the 50-year mark
134 of the 379 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 58.6% 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 49.5% of the county's Poor-condition bridge traffic
I0010 over VET MEM HWY, built 1967, carries 137,542 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 17-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 278,108 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Jefferson County's bridges were built
379 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 17
1950–1959
17 bridges
- 1960s
1960–1969
69 bridges
- 1970s
1970–1979
71 bridges
- 1980s
1980–1989
76 bridges
- 1990s
1990–1999
49 bridges
- 2000s
2000–2009
52 bridges
- 2010s
2010–2019
36 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1980s, when 76 of the county's bridges still in the inventory were built, which is 20.1% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1984) matches the Louisiana average (1982).
How Jefferson County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Jefferson County in number of bridges, with their condition splits. Its 4.5% Poor share is the 1st-lowest of these 6. Its average build year of 1984 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 |
|---|---|---|---|---|---|
| Orleans County | 382 | 43.7% | 46.3% | 9.9% | 1976 |
| Jefferson County (this page) | 379 | 58.6% | 36.9% | 4.5% | 1984 |
| St. Tammany County | 360 | 33.3% | 60.6% | 6.1% | 1976 |
| Vernon County | 341 | 57.8% | 34.6% | 7.6% | 1989 |
| Ouachita County | 337 | 27.9% | 59.3% | 12.8% | 1981 |
| Lafayette County | 322 | 44.7% | 47.5% | 7.8% | 1986 |
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 Jefferson 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 Jefferson County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (379 bridges here).
- Graves County, KY · 380 bridges
- Lincoln County, MS · 380 bridges
- Butler County, PA · 378 bridges
- Baldwin County, AL · 381 bridges
Similar average build year
Nearest mean year-built outside LA (1984 here).
- Hennepin County, MN · avg 1984 · 936 bridges
- Duval County, FL · avg 1984 · 831 bridges
- El Paso County, CO · avg 1984 · 686 bridges
- Bell County, TX · avg 1984 · 660 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (222)
I0010
GoodOver: TRANSCONTINENTAL DR.
3.0 MI EAST OF LA 49, Jefferson, LA
Built 1967 Load: 47.2 t ADT: 137,542
I0010
GoodOver: VET MEM HWY
2.1 MI EAST OF LA 49, Jefferson, LA
Built 1967 Load: 48.1 t ADT: 4,217
Sauve Road
GoodOver: Soniat Canal
0.5 Mi. S. f US 61, Jefferson, LA
Built 2021 Load: 49.2 t ADT: 10,700
LA3139
GoodOver: LA 3152 RAMPS A B D&E
.5 MI EAST OF LA 3154, Jefferson, LA
Built 1986 Load: 50.8 t ADT: 55,872
30TH STREET
GoodOver: DUNCAN CANAL
1.2 MI E OF LOYOLA AVENUE, Jefferson, LA
Built 1999 Load: 52.2 t
US0061
GoodOver: SONI DRAIN CANAL
0.10 MI. WEST OF 3154, Jefferson, LA
Built 1996 Load: 53.5 t ADT: 21,574
I0010
GoodOver: SUBURBAN CANAL
4.0 MI EAST OF LA 49, Jefferson, LA
Built 1967 Load: 53.5 t ADT: 14,843
I0010
GoodOver: SUBURBAN CANAL
4.1 MI EAST OF LA 49, Jefferson, LA
Built 1967 Load: 53.5 t ADT: 4,072
I0010
GoodOver: I-10 POWER BLVD.
1.24 MI EAST OF LA 49, Jefferson, LA
Built 1994 Load: 54.4 t ADT: 15,955
I0010
GoodOver: SUBURBAN CANAL
4.1 MI EAST OF LA 49, Jefferson, LA
Built 1967 Load: 57.2 t ADT: 137,542
I0010
GoodOver: SUBURBAN CANAL
4.1 MI EAST OF LA 49, Jefferson, LA
Built 1967 Load: 57.2 t ADT: 41,695
W. ESPLANADE
GoodOver: DUNCAN CANAL
0.4 Mi W of LA 49, Jefferson, LA
Built 2020 Load: 58.6 t ADT: 28,547
JOHN EHRET SCHOOL
GoodOver: PATRIOT CANAL
0.5 MI E OF LA 45, Jefferson, LA
Built 2015 Load: 62.2 t ADT: 2,400
JOHN EHRET SCHOOL
GoodOver: PATRIOT CANAL
0.4 MI E OF LA 45, Jefferson, LA
Built 2015 Load: 62.2 t ADT: 2,400
LA6119
GoodOver: METAIRIE RELIEF CANAL
.68 MI NORTH OF I-10, Jefferson, LA
Built 2000 Load: 64.4 t ADT: 13,208
LA3139
GoodOver: DRAIN CANAL
1.5 MILES SOUTH OF US 61, Jefferson, LA
Built 1986 Load: 74.5 t ADT: 55,872
ALLO St
GoodOver: PATRIOT CANAL
0.5 MI E OF LA 45, Jefferson, LA
Built 2015 Load: 74.5 t ADT: 60
LA3154
GoodOver: DRAIN
3.0 MI NORTH OF LA 48, Jefferson, LA
Built 1956 Load: 74.5 t ADT: 29,942
LA3135
GoodOver: LITTLE FARMS DRAIN CANAL
0.04 MI N OF MISTLETOE ST, Jefferson, LA
Built 1982 Load: 74.5 t ADT: 8,125
MANHATTAN BLVD
GoodOver: THREE MILE CANAL
0.6 MI N OF LAPALCO BLVD, Jefferson, LA
Built 1964 Load: 74.5 t ADT: 2,000
ESPLANADE U-TURN
GoodOver: CANAL #2
3.5 MI E OF CAUSEWAY BLVD, Jefferson, LA
Built 1970 Load: 74.5 t
ESPLANADE U-TURN
GoodOver: CANAL NO.2
0.01MI.S.OF.W.ESPLAN, Jefferson, LA
Built 1970 Load: 74.5 t ADT: 10,000
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.