Total bridges
40
Public highway bridges in St. John the Baptist County
County profile · official public datasets
St. John the Baptist County, LA
40 public highway bridges tracked in the FHWA National Bridge Inventory: 37.5% rated Good, 60% Fair, 2.5% Poor.
- 40
- Public bridges
- 37.5%
- Good condition
- 2.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
St. John the Baptist County posts a top-5% lowest Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 3%
- lowest Poor share in state
- 2.5%
- Poor-condition share
- 40
- public highway bridges
- 1979
- 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.
St. John the Baptist County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, St. John the Baptist County ranks #2 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.5%). St. John the Baptist County, Louisiana contains 40 public highway bridges. Roughly 37.5% are rated “Good,” 60% “Fair,” and 2.5% “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
37.5%
15 of 40 rated 7-9
Fair condition
60%
24 of 40 rated 5-6
Poor condition
2.5%
1 of 40 rated 4 or below
In-state Poor-share rank
#2 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 40 NBI-tracked bridges by lowest applicable component rating.
Good 37.5% (15)
Fair 60% (24)
Poor 2.5% (1)
35% of St. John the Baptist County's bridges have passed the 50-year mark
14 of the 40 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 37.5% 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.
When St. John the Baptist County's bridges were built
40 bridges with a recorded construction year, grouped by decade
- 1960s
1960–1969
8 bridges
- 1970s
1970–1979
20 bridges
- 1980s 4
1980–1989
4 bridges
- 1990s 3
1990–1999
3 bridges
- 2000s 2
2000–2009
2 bridges
- 2010s 3
2010–2019
3 bridges
What this shows Construction peaked in the 1970s, when 20 of the county's bridges still in the inventory were built, which is 50% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1979) matches the Louisiana average (1982).
How St. John the Baptist County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest St. John the Baptist County in number of bridges, with their condition splits. Its 2.5% Poor share is the 1st-lowest of these 6. Its average build year of 1979 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 |
|---|---|---|---|---|---|
| Tensas County | 52 | 57.7% | 38.5% | 3.8% | 1979 |
| Pointe Coupee County | 50 | 22% | 52% | 26% | 1970 |
| St. Bernard County | 47 | 55.3% | 38.3% | 6.4% | 1998 |
| Concordia County | 42 | 45.2% | 45.2% | 9.5% | 1982 |
| St. John the Baptist County (this page) | 40 | 37.5% | 60% | 2.5% | 1979 |
| Plaquemines County | 34 | 17.6% | 61.8% | 20.6% | 1981 |
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 St. John the Baptist 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 St. John the Baptist County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (40 bridges here).
- Taliaferro County, GA · 40 bridges
- Clark County, ID · 40 bridges
- Douglas County, MN · 40 bridges
- Mahnomen County, MN · 40 bridges
Similar average build year
Nearest mean year-built outside LA (1979 here).
- Pima County, AZ · avg 1979 · 1,150 bridges
- Jefferson County, KY · avg 1979 · 662 bridges
- Spartanburg County, SC · avg 1979 · 638 bridges
- McPherson County, KS · avg 1979 · 586 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (24)
I0010
FairOver: RESERVE RELIEF CANAL
I 10, St. John the Baptist, LA
Built 1974 Load: 29.0 t ADT: 44,074
LA3213
FairOver: GRAMERCY BRIDGE WEST BAN
GRAMERCY, St. John the Baptist, LA
Built 1995 Load: 29.8 t ADT: 13,743
I0055
FairOver: DRAIN PIPE XING
NORTH OF US 51 & I55 EXIT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0055
FairOver: DRAIN PIPE XING
2.0 M N - I55 & US51 EXIT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0055
FairOver: DRAIN PIPE XING
2.4 M N - I55 & US51 EXIT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0055
FairOver: DRAIN PIPE XING
3 MI N - I55 & US 51 JCT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0055
FairOver: DRAIN PIPE XING
M N - US51 & I55 JCT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0055
FairOver: DRAIN PIPE XING
7.6 M N - I55 & US51 JCT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0055
FairOver: DRAINAGE PIPE XING
2.0 M N -I55 & US51 EXIT, St. John the Baptist, LA
Built 1960 Load: 32.4 t ADT: 4,107
I0010
FairOver: US 51 & SWAMPS
I0010, St. John the Baptist, LA
Built 1972 Load: 33.6 t ADT: 48,723
I0055
FairOver: I-55 OVER US 51 & SWAMP
I055, St. John the Baptist, LA
Built 1975 Load: 35.4 t ADT: 24,000
I0055
FairOver: I 55 SOUTH ON RAMP RUDDC
0.1 M W OF US 51, St. John the Baptist, LA
Built 1975 Load: 36.3 t ADT: 8,115
LA3188
FairOver: LA 3188 OVER I-10
2.2 M N OF US 61, St. John the Baptist, LA
Built 1984 Load: 36.3 t ADT: 6,786
St. Andrews Blvd.
FairOver: CANAL
1.6 MILES EAST OF LA 3188, St. John the Baptist, LA
Built 1997 Load: 36.9 t ADT: 300
St. Andrews Blvd.
FairOver: CANAL
1.6 MILES EAST OF LA 3188, St. John the Baptist, LA
Built 1997 Load: 36.9 t ADT: 300
US0051
FairOver: DRAINAGE CANAL
0.1 M NE OF I-55, St. John the Baptist, LA
Built 1975 Load: 38.1 t ADT: 16,686
I0010
FairOver: EB ON RAMP (US51)
I0010, St. John the Baptist, LA
Built 1972 Load: 41.7 t ADT: 15,642
US0051
FairOver: DRAINAGE CANAL
0.1 M NE OF I-55, St. John the Baptist, LA
Built 1975 Load: 42.6 t ADT: 20,097
I0010
FairOver: HOPE CANAL
I0010, St. John the Baptist, LA
Built 1975 Load: 45.4 t ADT: 44,074
I0010
FairOver: HOPE CANAL
I0010, St. John the Baptist, LA
Built 1975 Load: 45.4 t ADT: 27,551
I0010
FairOver: MISSISSIPPI BAYOU
I0010, St. John the Baptist, LA
Built 1975 Load: 45.4 t ADT: 44,074
I0010
FairOver: MISSISSIPPI BAYOU
I0010, St. John the Baptist, LA
Built 1975 Load: 45.4 t ADT: 27,551
I0010
FairOver: Drain
0.10 Mi. E. of LA 3188, St. John the Baptist, LA
Built 1984 Load: 74.5 t ADT: 27,372
I0010
FairOver: Drain
0.75 Mi. E. of LA 3188, St. John the Baptist, LA
Built 1984 Load: 74.5 t ADT: 27,372
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.