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.
Good-condition bridges (27)
IKES RD
GoodOver: KINDER DITCH
0.6 MI W of US 165, Allen, LA
Built 1999 Load: 18.5 t ADT: 136
MAHAFFEY RD
GoodOver: FLAT CREEK
2.5 MI SOUTH OF LA 26, Allen, LA
Built 1998 Load: 18.5 t ADT: 110
NORTH NINTH ST
GoodOver: CREEK
0.2 MI N of LA 26, Allen, LA
Built 2007 Load: 18.8 t ADT: 119
GUIDRY RD
GoodOver: NEZIPIQUE BAYOU RELIEF
1.5 MI N of LA1159, Allen, LA
Built 2011 Load: 23.3 t ADT: 36
N CARPENTERS BR RD
GoodOver: FLAT CREEK RELIEF
3.7 MI SOUTH OF LA 26, Allen, LA
Built 2010 Load: 23.3 t ADT: 250
FUSELIER LN
GoodOver: OBERLIN DITCH
0.5 MI N of W 9TH AVE, Allen, LA
Built 2011 Load: 23.7 t ADT: 125
CARRIER RD
GoodOver: GUM BRANCH
3.1 MI EAST OF US 165, Allen, LA
Built 2011 Load: 23.7 t ADT: 180
THIRTEENTH ST
GoodOver: CREEK
0.2 MILES SOUTH OF LA 26, Allen, LA
Built 2011 Load: 24.6 t ADT: 900
LA0112
GoodOver: DRAIN
3.0 MI E of LA 113, Allen, LA
Built 2011 Load: 29.5 t ADT: 718
US0165
GoodOver: DRAIN
0.8 MI N OF LA 1152, Allen, LA
Built 1981 Load: 32.4 t ADT: 11,079
US0165
GoodOver: DRAINAGE DITCH
8.9 MI N OF LA 102, Allen, LA
Built 2002 Load: 32.4 t ADT: 11,886
US0165
GoodOver: DRAINAGE DITCH
0.2 MI N of LA 26, Allen, LA
Built 2002 Load: 32.4 t ADT: 11,886
ELOI ORTEGO RD
GoodOver: CREEK
0.5 MI. NW OF US 190, Allen, LA
Built 1992 Load: 32.4 t ADT: 240
MATTHEW ST
GoodOver: DRAIN
50 FT N of LA10, Allen, LA
Built 2008 Load: 32.4 t ADT: 194
SAM CLOUD RD
GoodOver: CREEK
2.8 MI N OF LA10, Allen, LA
Built 2007 Load: 32.4 t ADT: 985
LA0377
GoodOver: WHISKEY CHITTO CREEK
2.1 MI N OF LA 26, Allen, LA
Built 1999 Load: 32.7 t ADT: 502
ARKADELPHIA RD
GoodOver: GASKINS BRANCH
4.1 MILES NORTH OF LA 112, Allen, LA
Built 2011 Load: 36.6 t ADT: 260
LA0377
GoodOver: CREEK
0.5 M N of LA 112, Allen, LA
Built 1982 Load: 38.1 t ADT: 238
BURNETT TOWN RD
GoodOver: AUSTIN BRANCH
0.7 MI W of B F TOWER RD, Allen, LA
Built 2011 Load: 39.9 t ADT: 64
GREEN OAK RD
GoodOver: STREAM
1.3 MI. NORTH OF US 165, Allen, LA
Built 2013 Load: 40.8 t ADT: 900
GREEN OAK RD
GoodOver: CREEK
0.6 MI N of US 165, Allen, LA
Built 2011 Load: 40.8 t ADT: 859
LA0010
GoodOver: CALCASIEU RIVER
0.8 MI. E OF INT LA3205, Allen, LA
Built 1982 Load: 40.8 t ADT: 4,806
REEDS BRIDGE ROAD
GoodOver: CALCASIEU RIVER RELIEF
2.0 MI EAST OF US 165, Allen, LA
Built 2023 Load: 43.7 t ADT: 300
DESHOTEL RD
GoodOver: CASTOR CREEK
1.1 MI E of Carrier Rd, Allen, LA
Built 2006 Load: 45.0 t ADT: 40
PARK RD
GoodOver: KINDER DITCH RELIEF
2.3 MI S OF LA 383, Allen, LA
Built 2018 Load: 46.0 t ADT: 377
PARK RD
GoodOver: KINDER DITCH
2.02 MI S OF LA 383, Allen, LA
Built 2018 Load: 46.0 t ADT: 377
LA1153
GoodOver: CALCASIEU RIVER TRIB
1.0 MI N of US 165, Allen, LA
Built 2003 Load: 47.2 t ADT: 1,822
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.