Total bridges
42
Public highway bridges in Concordia County
County profile · official public datasets
Concordia County, LA
42 public highway bridges tracked in the FHWA National Bridge Inventory: 45.2% rated Good, 45.2% Fair, 9.5% Poor.
- 42
- Public bridges
- 45.2%
- Good condition
- 9.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Concordia County posts a better-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 45%
- lowest Poor share in state
- 9.5%
- Poor-condition share
- 42
- public highway bridges
- 1982
- 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.
Concordia County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Concordia County ranks #29 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.5%). Concordia County, Louisiana contains 42 public highway bridges. Roughly 45.2% are rated “Good,” 45.2% “Fair,” and 9.5% “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
45.2%
19 of 42 rated 7-9
Fair condition
45.2%
19 of 42 rated 5-6
Poor condition
9.5%
4 of 42 rated 4 or below
In-state Poor-share rank
#29 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 42 NBI-tracked bridges by lowest applicable component rating.
Good 45.2% (19)
Fair 45.2% (19)
Poor 9.5% (4)
Concordia County's Poor-condition bridges carry 6,875 vehicle crossings a day
That is 8.1% of the county's reported daily bridge traffic on 7.3% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 2,292 crossings a day against 1,103 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 41 of 42 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.3% of Concordia County's bridges have passed the 50-year mark
14 of the 42 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 45.2% 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 89.6% of the county's Poor-condition bridge traffic
US0084 over CANEY BAYOU, built 1932, carries 6,163 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 4-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 6,875 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Concordia County's bridges were built
42 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s 3
1950–1959
3 bridges
- 1960s 3
1960–1969
3 bridges
- 1970s
1970–1979
9 bridges
- 1980s
1980–1989
13 bridges
- 1990s 3
1990–1999
3 bridges
- 2000s
2000–2009
6 bridges
- 2010s 3
2010–2019
3 bridges
What this shows Construction peaked in the 1980s, when 13 of the county's bridges still in the inventory were built, which is 31% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1982) matches the Louisiana average (1982).
How Concordia County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Concordia County in number of bridges, with their condition splits. Its 9.5% Poor share is the 4th-lowest of these 6. Its average build year of 1982 against a peer-group mean of 1981 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 (this page) | 42 | 45.2% | 45.2% | 9.5% | 1982 |
| St. John the Baptist County | 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 Concordia 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 Concordia County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (42 bridges here).
- Montgomery County, GA · 42 bridges
- Lee County, KY · 42 bridges
- Talbot County, MD · 42 bridges
- Chouteau County, MT · 42 bridges
Similar average build year
Nearest mean year-built outside LA (1982 here).
- Oklahoma County, OK · avg 1982 · 1,216 bridges
- Jackson County, MO · avg 1982 · 930 bridges
- Milwaukee County, WI · avg 1982 · 893 bridges
- Champaign County, IL · avg 1982 · 727 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (19)
LA0568
FairOver: LAKE ST JOHN DRAIN CA
4.8 MI SOUTH OF LA 570, Concordia, LA
Built 1973 Load: 12.4 t ADT: 2,265
LA0015
FairOver: VIDALIA CANAL
10.54 MI NORTH OF LA 565, Concordia, LA
Built 1961 Load: 20.7 t ADT: 393
LA0015
FairOver: RED BAYOU CANAL
13.69 MI NORTH OF LA 565, Concordia, LA
Built 1961 Load: 20.7 t ADT: 393
US0065
FairOver: MISSISSIPPI RIVER
.01 MI EAST OF LA 131, Concordia, LA
Built 1940 Load: 23.0 t ADT: 21,661
Wildcow Bayou Rd
FairOver: Cocodrie Bayou
LOGMI 3.60 E FROM Hwy 129, Concordia, LA
Built 1984 Load: 24.3 t ADT: 110
Wildcow Rd
FairOver: Cocodrie Bayou
LOG MI 2.55 SE OF Hwy 129, Concordia, LA
Built 1984 Load: 24.3 t ADT: 110
US0084
FairOver: BLACK RIVER
16 MILES FROM JCT. US 84, Concordia, LA
Built 2009 Load: 26.2 t ADT: 7,080
LA0566
FairOver: LITTE TENSAS RIVE
2.25 MI E OF LA 15, Concordia, LA
Built 1970 Load: 26.3 t ADT: 216
LA0015
FairOver: CREEK
4.14 M S of LA 565, Concordia, LA
Built 2004 Load: 27.9 t ADT: 399
LA0129
FairOver: Ross Bayou
1.03 MI NORTH OF LA 565, Concordia, LA
Built 2000 Load: 30.5 t ADT: 1,684
Apple Street
FairOver: VIDALIA CANAL
0.04 MI N of Peach Street, Concordia, LA
Built 1970 Load: 30.8 t ADT: 200
LA0015
FairOver: OLD RIVER LOW SILL C.S.
75 MI NW OF BATON ROUGE, Concordia, LA
Built 1959 Load: 32.4 t ADT: 602
Red R. Levee Rd
FairOver: Cocodrie Bayou
0.8 MI N OF LA 910, Concordia, LA
Built 1955 Load: 32.4 t ADT: 16
BoDark Rd
FairOver: Cocodrie BAYOU
0.03 LOG MI E Of HWY 906, Concordia, LA
Built 1986 Load: 33.7 t ADT: 130
US0065
FairOver: MISSISSIPPI RIVER
.01 MI EAST OF LA 131, Concordia, LA
Built 1989 Load: 36.4 t ADT: 20,933
Dan Howard Rd
FairOver: BLACK BAYOU
0.5 MI E OF LA900, Concordia, LA
Built 1986 Load: 37.9 t ADT: 30
LA0129
FairOver: SIX MILE BAYOU
1.35 MI N OF LA 909, Concordia, LA
Built 1971 Load: 38.1 t ADT: 161
LA0015
FairOver: CREEK
8.69 MI EAST OF LA 910, Concordia, LA
Built 1980 Load: 39.0 t ADT: 399
LA0566
FairOver: CANEY BAYOU
0.17 M N of US 84, Concordia, LA
Built 1985 Load: 39.0 t ADT: 74
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.