Total bridges
178
Public highway bridges in Allen County
County profile · official public datasets
Allen County, LA
178 public highway bridges tracked in the FHWA National Bridge Inventory: 15.2% rated Good, 72.5% Fair, 12.4% Poor.
- 178
- Public bridges
- 15.2%
- Good condition
- 12.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Allen County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 39th
- of 64 on Poor share
- 12.4%
- Poor-condition share
- 178
- public highway bridges
- 1983
- 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.
Allen County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Allen County ranks #39 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 12.4%). Allen County, Louisiana contains 178 public highway bridges. Roughly 15.2% are rated “Good,” 72.5% “Fair,” and 12.4% “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
15.2%
27 of 178 rated 7-9
Fair condition
72.5%
129 of 178 rated 5-6
Poor condition
12.4%
22 of 178 rated 4 or below
In-state Poor-share rank
#39 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 178 NBI-tracked bridges by lowest applicable component rating.
Good 15.2% (27)
Fair 72.5% (129)
Poor 12.4% (22)
Allen County's Poor-condition bridges carry 16,229 vehicle crossings a day
That is 4.1% of the county's reported daily bridge traffic on 12.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 738 crossings a day against 1,829 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 178 of 178 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.1% of Allen County's bridges have passed the 50-year mark
59 of the 178 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 15.2% 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 24.2% of the county's Poor-condition bridge traffic
US0190 over WEST CALCASIEU RIVER REL, built 1980, carries 3,923 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 22-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 16,229 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Allen County's bridges were built
178 bridges with a recorded construction year, grouped by decade
- 1920s 2
1920–1929
2 bridges
- 1930s 11
1930–1939
11 bridges
- 1950s
1950–1959
16 bridges
- 1960s
1960–1969
19 bridges
- 1970s
1970–1979
21 bridges
- 1980s
1980–1989
24 bridges
- 1990s
1990–1999
30 bridges
- 2000s
2000–2009
37 bridges
- 2010s
2010–2019
17 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 2000s, when 37 of the county's bridges still in the inventory were built, which is 20.8% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1983) matches the Louisiana average (1982).
How Allen County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Allen County in number of bridges, with their condition splits. Its 12.4% Poor share is the 3rd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1980 is in line with the group.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| LaSalle County | 195 | 60% | 34.4% | 5.6% | 1983 |
| Webster County | 194 | 21.6% | 53.1% | 25.3% | 1975 |
| Bienville County | 190 | 20% | 51.6% | 28.4% | 1979 |
| Allen County (this page) | 178 | 15.2% | 72.5% | 12.4% | 1983 |
| Lincoln County | 171 | 22.8% | 63.7% | 13.5% | 1982 |
| Jackson County | 163 | 28.2% | 64.4% | 7.4% | 1982 |
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 Allen 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 Allen County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (178 bridges here).
- Webster County, MS · 178 bridges
- Clark County, MO · 178 bridges
- Monroe County, MO · 178 bridges
- Ontario County, NY · 178 bridges
Similar average build year
Nearest mean year-built outside LA (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (129)
S TENTH ST
FairOver: CANEY CREEK
0.1 MILES SOUTH OF LA 383, Allen, LA
Built 1979 Load: 26.1 t ADT: 284
LA0026
FairOver: CREEK
4.0 MI. SE OF LA 377, Allen, LA
Built 1968 Load: 26.3 t ADT: 2,151
US0165
FairOver: KINDER DITCH
6.6 MI N of LA-102, Allen, LA
Built 1932 Load: 28.2 t ADT: 11,886
LA0010
FairOver: BEAVER CREEK
1.8 MI. E OF INT LA372, Allen, LA
Built 1950 Load: 29.0 t ADT: 3,242
LA0112
FairOver: PERKINS BRANCH
0.1 MI W of LA 377, Allen, LA
Built 2009 Load: 29.5 t ADT: 718
LA0112
FairOver: DRAIN
3.4 MI E of LA 113, Allen, LA
Built 2010 Load: 29.5 t ADT: 718
HICKORY FLAT RD
FairOver: CREEK
1.8 MI S OF WARD LINE RD, Allen, LA
Built 1982 Load: 29.5 t ADT: 47
US0165
FairOver: BAYOU
2.7 MI. N. OF US 190, Allen, LA
Built 2008 Load: 32.4 t ADT: 11,196
US0165
FairOver: BAYOU
3.3 MI NORTH OF US 190, Allen, LA
Built 2008 Load: 32.4 t ADT: 11,196
US0165
FairOver: DRAIN
2.0 MI NORTH OF LA 10, Allen, LA
Built 2008 Load: 32.4 t ADT: 7,676
US0190
FairOver: KINDER CANAL
1.75 MI. E OF INT US165, Allen, LA
Built 1932 Load: 32.4 t ADT: 6,929
US0190
FairOver: DRAIN
3.27 MI. E OF INT US 165, Allen, LA
Built 1957 Load: 32.4 t ADT: 6,929
US0165
FairOver: DRAIN
4.3 MI. N. OF INT. LA 26, Allen, LA
Built 1931 Load: 32.4 t ADT: 11,886
US0165
FairOver: DRAIN
10.06 MI. N OF INT LA 26, Allen, LA
Built 1931 Load: 32.4 t ADT: 11,886
US0165
FairOver: DRAIN
11.3 MI. N. OF LA 26, Allen, LA
Built 1931 Load: 32.4 t ADT: 11,886
US0165
FairOver: DRAIN
4.3 MI. N OF INT LA1153, Allen, LA
Built 2008 Load: 32.4 t ADT: 11,113
LA0026
FairOver: BRUSHY BRANCH
0.7 MI SE OF LA 377, Allen, LA
Built 1927 Load: 32.4 t ADT: 2,151
LA0026
FairOver: DRAIN
1.4 MI. SE OF LA 377, Allen, LA
Built 1927 Load: 32.4 t ADT: 2,151
LA0026
FairOver: BAYOU BLUE
1.24 MI. E OF INT US165, Allen, LA
Built 1958 Load: 32.4 t ADT: 2,746
LA0010
FairOver: BAYOU
3 MI E of LA 112, Allen, LA
Built 1972 Load: 32.4 t ADT: 2,982
LA0113
FairOver: DRAIN
1.92 MI. N OF INT US190, Allen, LA
Built 1959 Load: 32.4 t ADT: 1,806
LA0112
FairOver: DRAIN
4.6 MI E Of LA 377, Allen, LA
Built 1960 Load: 32.4 t ADT: 1,138
LA0383
FairOver: DRAIN
4.9 MI W OF US 165, Allen, LA
Built 1959 Load: 32.4 t ADT: 2,193
LA0377
FairOver: DRAIN
4.32 MI. N OF INT LA26, Allen, LA
Built 1959 Load: 32.4 t ADT: 590
MARTIN TRAM RD
FairOver: BARNES CREEK
3.2 MI SW OF SNOOKYS RD, Allen, LA
Built 1985 Load: 32.4 t ADT: 414
CRIP DUPLECHAIN RD
FairOver: BAYOU SERPENT
0.5 MI E OF E. ORTEGO RD, Allen, LA
Built 2001 Load: 32.4 t ADT: 43
LITTLE MILL RD
FairOver: STREAM
0.6 MILES S OF US 190, Allen, LA
Built 1997 Load: 32.4 t ADT: 1,071
GARCILLE RD
FairOver: OBERLIN DITCH
0.5 MI N of 9TH AVE, Allen, LA
Built 1997 Load: 32.4 t ADT: 300
TYLER RD
FairOver: WEST FORK CANEY CREEK
1.0 MI. S. OF LA. 372, Allen, LA
Built 1997 Load: 32.7 t ADT: 202
MILLER ST
FairOver: CREEK
0.1 MI N OF W BECK AVE, Allen, LA
Built 1997 Load: 32.7 t ADT: 450
GUIDRY RD
FairOver: NEZPIQUE BAYOU
1.1 MI N of LA1159, Allen, LA
Built 1986 Load: 33.7 t ADT: 36
US0165
FairOver: BAYOU
2.2 MI. S. OF LA 26, Allen, LA
Built 2008 Load: 34.0 t ADT: 11,447
COTTONGIN CASTOR
FairOver: CASTOR CREEK
2.70M NORTH OF LA 104, Allen, LA
Built 1991 Load: 35.3 t ADT: 49
US 190
FairOver: SLOUGH
8.6 MI. E OF LA 113, Allen, LA
Built 1976 Load: 36.3 t ADT: 2,958
CARPENTERS BRDG RD
FairOver: PERRY CREEK
7.0 MI N of US 190, Allen, LA
Built 2000 Load: 36.3 t ADT: 100
DESHOTEL RD
FairOver: GUM BRANCH
3.4 MI EAST OF US 165, Allen, LA
Built 1985 Load: 36.3 t ADT: 32
TEN MILE RD
FairOver: TEN MILE CREEK
2.0 MI NORTH OF LA 26, Allen, LA
Built 2008 Load: 36.3 t ADT: 150
REEDS BRIDGE RD
FairOver: CALCASIEU RIVER
1.7 MILES WEST OF US 165, Allen, LA
Built 2011 Load: 36.6 t ADT: 132
OLD PUMP RD
FairOver: CALCASIEU RIVER RELIEF
0.6 MI. W. OF CHAPPEL RD, Allen, LA
Built 1985 Load: 36.6 t ADT: 581
OLD PUMP RD
FairOver: CALCASIEU RIVER RELIEF
0.8 MI. W. OF CHAPPEL RD, Allen, LA
Built 1985 Load: 36.6 t ADT: 581
COTTONGIN CASTOR
FairOver: MITCHELL CREEK
0.4 MI E OF HEBERT RD., Allen, LA
Built 1985 Load: 36.6 t ADT: 131
BURGESS RD
FairOver: FLAT CREEK
3.5 MI SW OF LA 26, Allen, LA
Built 1992 Load: 36.6 t ADT: 30
DAVE SMITH RD
FairOver: BOTTOM CREEK
1.2 MI SW OF LA 26, Allen, LA
Built 1993 Load: 36.6 t ADT: 291
WARD RD
FairOver: MITCHELL CREEK
1.6 MI EAST OF LA 372, Allen, LA
Built 1985 Load: 36.6 t ADT: 358
REEDS BRIDGE RD
FairOver: CALCASIEU RIVER RELIEF
1.66 MI. W. OF US 165, Allen, LA
Built 1983 Load: 36.6 t ADT: 132
TRAMEL RD
FairOver: FLAT CREEK
1.2 MI WEST OF LA 26, Allen, LA
Built 1990 Load: 36.6 t ADT: 80
CYPRESS CREEK RD
FairOver: BEAVER CREEK
0.30 MI. N. OF LA 10, Allen, LA
Built 1984 Load: 36.6 t ADT: 533
TOM JEFF RD
FairOver: TEN MILE CREEK
1.8 MI EAST OF LA 377, Allen, LA
Built 1984 Load: 36.6 t ADT: 180
WALKER RD
FairOver: CREEK
1.6 MI NORTH OF US 190, Allen, LA
Built 1997 Load: 36.9 t ADT: 150
COTTONGIN CASTOR
FairOver: BLUE BAYOU
0.8 MI E OF DARBORNE LN, Allen, LA
Built 1999 Load: 36.9 t ADT: 180
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.