Total bridges
216
Public highway bridges in Ascension County
County profile · official public datasets
Ascension County, LA
216 public highway bridges tracked in the FHWA National Bridge Inventory: 41.2% rated Good, 45.8% Fair, 13% Poor.
- 216
- Public bridges
- 41.2%
- Good condition
- 13%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Ascension County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 41st
- of 64 on Poor share
- 13%
- Poor-condition share
- 216
- public highway bridges
- 1981
- 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.
Ascension County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Ascension County ranks #41 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 13%). Ascension County, Louisiana contains 216 public highway bridges. Roughly 41.2% are rated “Good,” 45.8% “Fair,” and 13% “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
41.2%
89 of 216 rated 7-9
Fair condition
45.8%
99 of 216 rated 5-6
Poor condition
13%
28 of 216 rated 4 or below
In-state Poor-share rank
#41 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 216 NBI-tracked bridges by lowest applicable component rating.
Good 41.2% (89)
Fair 45.8% (99)
Poor 13% (28)
Ascension County's Poor-condition bridges carry 84,926 vehicle crossings a day
That is 3.1% of the county's reported daily bridge traffic on 13% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,033 crossings a day against 11,680 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 216 of 216 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.8% of Ascension County's bridges have passed the 50-year mark
73 of the 216 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 41.2% 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 13.4% of the county's Poor-condition bridge traffic
LA0427 over BAYOU MANCHAC, built 1972, carries 11,384 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 28-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 84,926 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Ascension County's bridges were built
216 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1950s 18
1950–1959
18 bridges
- 1960s
1960–1969
33 bridges
- 1970s
1970–1979
74 bridges
- 1980s 26
1980–1989
26 bridges
- 1990s 22
1990–1999
22 bridges
- 2000s 27
2000–2009
27 bridges
- 2010s 10
2010–2019
10 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 1970s, when 74 of the county's bridges still in the inventory were built, which is 34.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1981) matches the Louisiana average (1982).
How Ascension County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Ascension County in number of bridges, with their condition splits. Its 13% Poor share is the 4th-lowest of these 6. Its average build year of 1981 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 |
|---|---|---|---|---|---|
| Beauregard County | 221 | 13.6% | 78.3% | 8.1% | 1979 |
| Winn County | 220 | 55.5% | 28.2% | 16.4% | 1987 |
| Ascension County (this page) | 216 | 41.2% | 45.8% | 13% | 1981 |
| Terrebonne County | 215 | 42.3% | 47% | 10.7% | 1983 |
| Grant County | 209 | 41.6% | 42.6% | 15.8% | 1982 |
| Richland County | 207 | 21.3% | 67.6% | 11.1% | 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 Ascension 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 Ascension County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (216 bridges here).
- Coffee County, AL · 216 bridges
- Miller County, AR · 216 bridges
- Clinton County, MI · 216 bridges
- Choctaw County, OK · 216 bridges
Similar average build year
Nearest mean year-built outside LA (1981 here).
- Franklin County, OH · avg 1981 · 922 bridges
- Greenville County, SC · avg 1981 · 635 bridges
- Montgomery County, OH · avg 1981 · 632 bridges
- McLean County, IL · avg 1981 · 624 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (216)
I0010
FairOver: US 61 & KCS RR
JCT of I-10 & US 61, Ascension, LA
Built 1975 Load: 31.8 t ADT: 21,372
US0061
FairOver: CANAL DRAIN
3 MI N INTER US 61 &LA22, Ascension, LA
Built 1982 Load: 32.4 t ADT: 29,303
LA0001
FairOver: MCMANOR CANAL
5.8 M SE of LA 1&LA 69, Ascension, LA
Built 1935 Load: 32.4 t ADT: 7,858
LA0044
FairOver: DRAINAGE
ON LA 44 1.0 MI N. LA 931, Ascension, LA
Built 1999 Load: 32.4 t ADT: 12,382
LA0030
FairOver: STREAM
0.4 M W of LA 30&LA 3251, Ascension, LA
Built 1968 Load: 32.4 t ADT: 16,790
I0010
FairOver: DRAIN
0.6 M S of I-10&LA 30, Ascension, LA
Built 1975 Load: 32.4 t ADT: 60,802
I0010
FairOver: BOYLE BAYOU
1.3 M S of I-10&LA 30, Ascension, LA
Built 1979 Load: 32.4 t ADT: 60,802
I0010
FairOver: HACKETT CANAL
1.2 M SE of I-10&LA 44, Ascension, LA
Built 1979 Load: 32.4 t ADT: 57,444
LA0928
FairOver: JIM BAYOU
0.8 M W of I-10&LA 73, Ascension, LA
Built 1966 Load: 32.4 t ADT: 5,446
Babin Rd
FairOver: GRAND GOUDINE BAYOU
0.5 M N of LA 74, Ascension, LA
Built 1970 Load: 32.7 t ADT: 500
Haydel Rd
FairOver: DRAIN BAYOU
3 MI.SW LA22 LA22 LA44 JC, Ascension, LA
Built 1997 Load: 33.6 t ADT: 50
I0010
FairOver: BAYOU CONWAY
0.3M SE JCT I-10 & LA 44, Ascension, LA
Built 1969 Load: 34.0 t ADT: 49,274
I0010
FairOver: BAYOU CONWAY
0.3M SE JCT I-10 & LA 44, Ascension, LA
Built 1969 Load: 34.0 t ADT: 21,372
LA0074
FairOver: I-10
1.9 Mi. E of LA 928, Ascension, LA
Built 1975 Load: 34.5 t ADT: 13,875
I0010
FairOver: BAYOU CONWAY
0.3 M SE of LA 44, Ascension, LA
Built 1979 Load: 34.7 t ADT: 25,735
I0010
FairOver: BAYOU CONWAY
0.3 M SE of LA 44, Ascension, LA
Built 1979 Load: 36.0 t ADT: 57,444
LA0431
FairOver: LAKE VILLAR
0.92 MI S of LA 42, Ascension, LA
Built 1983 Load: 36.3 t ADT: 9,608
Germany Rd
FairOver: BAYOU BLACK
2.8 MI. S. LITTLE PRAIRIE, Ascension, LA
Built 2000 Load: 36.6 t ADT: 750
I0010
FairOver: BAYOU MANCHAC
I0010, Ascension, LA
Built 1970 Load: 36.9 t ADT: 45,150
I0010
FairOver: BAYOU MANCHAC
I0010, Ascension, LA
Built 1970 Load: 36.9 t ADT: 45,150
LA0042
FairOver: AMITE RIVER RELIEF
0.7 Mi. E of LA 933, Ascension, LA
Built 2011 Load: 37.3 t ADT: 8,186
I0010
FairOver: DRAINAGE CANAL
1.9 Mi W of LA 22, Ascension, LA
Built 1979 Load: 37.3 t ADT: 25,735
LA0022
FairOver: BAYOU CONWAY
0.1 M NORTH I-10 & LA 22, Ascension, LA
Built 1990 Load: 38.6 t ADT: 11,127
I0010
FairOver: LA429/Cornerview Rd
2.2 Mi. E. of LA 73, Ascension, LA
Built 1975 Load: 39.0 t ADT: 60,802
LA0070
FairOver: BAYOU VERRETTE
0.2 M E of LA 70&LA 3120, Ascension, LA
Built 1972 Load: 39.9 t ADT: 15,051
I0010
FairOver: I-10 OVER LA 30
I0010, Ascension, LA
Built 1975 Load: 40.5 t ADT: 60,802
I0010
FairOver: I-10 OVER LA 30
I0010, Ascension, LA
Built 1975 Load: 40.5 t ADT: 25,735
New River Canal Rd
FairOver: DRAINAGE BAYOU
1.3 MI. S. DUTCHTOWN, Ascension, LA
Built 2001 Load: 40.5 t ADT: 100
LA0044
FairOver: BAYOU NARCISSE
700 FT. N. JCT. US 61, Ascension, LA
Built 1985 Load: 40.8 t ADT: 17,577
LA0044
FairOver: BAYOU CALBASSE
500 FT. S. JCT. LA 621, Ascension, LA
Built 1985 Load: 40.8 t ADT: 17,577
LA0022
FairOver: BAYOU CONWAY
0.1 M NORTH I-10 & LA 22, Ascension, LA
Built 1990 Load: 40.8 t ADT: 17,134
LA0070
FairOver: BAYOU VERRETTE
0.2 M E of LA 70&LA 3120, Ascension, LA
Built 1964 Load: 40.8 t ADT: 15,589
I0010
FairOver: LA 73
4.7 Mi. W. of LA 30, Ascension, LA
Built 1975 Load: 40.8 t ADT: 25,735
I0010
FairOver: ON RP FR S US61 TO E I10
0.08 M S of I-10&US 61, Ascension, LA
Built 1975 Load: 40.8 t ADT: 8,115
LA0044
FairOver: CONWAY BAYOU
LA 44 @ I-10, Ascension, LA
Built 1974 Load: 41.7 t ADT: 13,914
LA0044
FairOver: CONWAY BAYOU
LA 44 @ I-10, Ascension, LA
Built 1978 Load: 41.7 t ADT: 13,542
LA0070
FairOver: PANAMA CANAL
LA3089, Ascension, LA
Built 1966 Load: 43.5 t ADT: 24,210
I0010
FairOver: I-10 OVER LA429/NEW RIVE
I0010, Ascension, LA
Built 1975 Load: 44.5 t ADT: 25,735
George Lambert Rd
FairOver: NEW RIVER
46 Ft N Of LA 429, Ascension, LA
Built 1984 Load: 45.0 t ADT: 300
I0010
FairOver: PANAMA CANAL
I0010, Ascension, LA
Built 1975 Load: 48.1 t ADT: 21,372
Denver Hurst Rd
FairOver: BAYOU CONWAY
1.3 MI SW-LA30 US 61 JCT, Ascension, LA
Built 1998 Load: 52.6 t ADT: 50
Churchpoint Rd
FairOver: BLACK BAYOU
2 MI N. LA 30 US 61 JCT., Ascension, LA
Built 2000 Load: 53.5 t ADT: 1,200
E John Templet Rd
FairOver: NEW RIVER CANAL
0.01 MI. N OF LA 429, Ascension, LA
Built 2001 Load: 54.4 t ADT: 25
George Lambert Rd
FairOver: BLACK BAYOU
0.5 M N OF LA 429, Ascension, LA
Built 2000 Load: 54.4 t ADT: 300
Denham Rd
FairOver: NEW RIVER CANAL
1.4 MI. N-LA30 US61 JCT., Ascension, LA
Built 2000 Load: 54.4 t ADT: 100
River Highlands Dr
FairOver: BAYOU PIERRE
1.1 MI. SE. OF LA 22, Ascension, LA
Built 1998 Load: 54.4 t ADT: 100
Cannon Rd
FairOver: BAYOU BLACK
1.6 ME. NE LA44 US61 JCT., Ascension, LA
Built 2000 Load: 54.4 t ADT: 200
I0010
FairOver: DRAIN
2.5 M N of I-10&LA 73, Ascension, LA
Built 1975 Load: 56.1 t ADT: 25,735
I0010
FairOver: DRAIN
2.5 M N of I-10&LA 73, Ascension, LA
Built 1975 Load: 57.3 t ADT: 60,802
LA0429
GoodOver: DUTCHTOWN DRAIN
1.9 M NE of LA 30&LA 73, Ascension, LA
Built 1957 Load: 20.9 t ADT: 9,071
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.