Total bridges
317
Public highway bridges in St. Landry County
County profile · official public datasets
St. Landry County, LA
317 public highway bridges tracked in the FHWA National Bridge Inventory: 43.2% rated Good, 49.2% Fair, 7.6% Poor.
- 317
- Public bridges
- 43.2%
- Good condition
- 7.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
St. Landry County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 27%
- lowest Poor share in state
- 7.6%
- Poor-condition share
- 317
- public highway bridges
- 1980
- 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. Landry County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, St. Landry County ranks #17 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.6%). St. Landry County, Louisiana contains 317 public highway bridges. Roughly 43.2% are rated “Good,” 49.2% “Fair,” and 7.6% “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
43.2%
137 of 317 rated 7-9
Fair condition
49.2%
156 of 317 rated 5-6
Poor condition
7.6%
24 of 317 rated 4 or below
In-state Poor-share rank
#17 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 317 NBI-tracked bridges by lowest applicable component rating.
Good 43.2% (137)
Fair 49.2% (156)
Poor 7.6% (24)
St. Landry County's Poor-condition bridges carry 68,494 vehicle crossings a day
That is 3.4% of the county's reported daily bridge traffic on 7.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,854 crossings a day against 5,876 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 317 of 317 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
38.5% of St. Landry County's bridges have passed the 50-year mark
122 of the 317 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 43.2% 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 29.5% of the county's Poor-condition bridge traffic
US0190 over MO PACIFIC RR, built 1962, carries 20,176 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 24-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 68,494 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When St. Landry County's bridges were built
317 bridges with a recorded construction year, grouped by decade
- 1930s 17
1930–1939
17 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s 20
1950–1959
20 bridges
- 1960s
1960–1969
65 bridges
- 1970s
1970–1979
44 bridges
- 1980s
1980–1989
73 bridges
- 1990s 26
1990–1999
26 bridges
- 2000s
2000–2009
47 bridges
- 2010s 20
2010–2019
20 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1980s, when 73 of the county's bridges still in the inventory were built, which is 23% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1980) matches the Louisiana average (1982).
How St. Landry County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest St. Landry County in number of bridges, with their condition splits. Its 7.6% Poor share is the 1st-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1984 is in line with the group.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| 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 |
| St. Landry County (this page) | 317 | 43.2% | 49.2% | 7.6% | 1980 |
| Natchitoches County | 313 | 46% | 38.7% | 15.3% | 1983 |
| Washington County | 285 | 44.2% | 44.2% | 11.6% | 1979 |
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. Landry 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. Landry County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (317 bridges here).
- Gwinnett County, GA · 317 bridges
- Cherokee County, KS · 317 bridges
- Washington County, MS · 317 bridges
- Van Wert County, OH · 317 bridges
Similar average build year
Nearest mean year-built outside LA (1980 here).
- Tulsa County, OK · avg 1980 · 1,135 bridges
- Miami-Dade County, FL · avg 1980 · 1,057 bridges
- Pulaski County, AR · avg 1980 · 721 bridges
- McLennan County, TX · avg 1980 · 714 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (317)
Park Ave
PoorOver: Richards Gully
0.30 Mi E OF Jake St, St. Landry, LA
Built 1987 Load: 14.3 t ADT: 1,500
LA0742
PoorOver: LITTLE BAYOU TECHE
0.5 MI WEST OF LA 31, St. Landry, LA
Built 1971 Load: 15.2 t ADT: 1,741
Lost Cayou Rd
PoorOver: DRAINAGE CANAL
0.52 Mi N of US 190, St. Landry, LA
Built 1960 Load: 15.2 t ADT: 100
Portage Levee Rd.
PoorOver: WEST LEVEE BORROW PIT
1.37 Mi NE of LA 737, St. Landry, LA
Built 1970 Load: 15.9 t ADT: 310
Courtableau Rd
PoorOver: Courtableau Bayou
0.25 MI N of US 190, St. Landry, LA
Built 1986 Load: 15.9 t ADT: 150
LA0178
PoorOver: BAYOU BOURBEAUX
0.40 MI EAST OF LA 182, St. Landry, LA
Built 1976 Load: 16.2 t ADT: 1,619
LA0752
PoorOver: DRAINAGE CANAL
0.64 MI WEST OF LA 751, St. Landry, LA
Built 1968 Load: 16.5 t ADT: 475
Veazie Rd
PoorOver: COMPANY CANAL
1.7 Mi N. of LA 10, St. Landry, LA
Built 1980 Load: 17.5 t ADT: 250
Gills Rd
PoorOver: DRAINAGE CANAL
0.10 MI N of Credeur Rd, St. Landry, LA
Built 1970 Load: 19.8 t ADT: 100
Airline Rd
PoorOver: Bayou Plaquemine Bruly
1.5 Mi. East of Ribbon Rd, St. Landry, LA
Built 1975 Load: 20.4 t ADT: 150
LA0010
PoorOver: PALMETTO CO CANAL
9.60 MI WEST OF LA 105, St. Landry, LA
Built 1959 Load: 24.0 t ADT: 1,185
I0049
PoorOver: LA0010
12.8 MI SE OF LA 29, St. Landry, LA
Built 1989 Load: 24.6 t ADT: 13,540
US0190
PoorOver: MO PACIFIC RR
0.4 MI EAST OF I-49, St. Landry, LA
Built 1962 Load: 25.3 t ADT: 20,176
WPA Rd
PoorOver: BAYOU BOEUF
0.1 Mi. E. of La 182, St. Landry, LA
Built 1975 Load: 27.2 t ADT: 750
US0190
PoorOver: LITTLE TECHE BAYOU
0.07 Mi W of LA 743, St. Landry, LA
Built 1962 Load: 30.8 t ADT: 10,487
I0049
PoorOver: LA0010
2 Miles North of LA 103, St. Landry, LA
Built 1989 Load: 43.5 t ADT: 9,668
LA0178
PoorOver: DRAINAGE CANAL
1.3 MI E of LA 357, St. Landry, LA
Built 1963 Load: 74.5 t ADT: 1,619
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.