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)
LA0022
GoodOver: NEW RIVER CANAL
LA0022, Ascension, LA
Built 1959 Load: 20.9 t ADT: 11,980
LA0022
GoodOver: PIERRES DRAINAGE
1.0 M SW of LA 22&LA 16, Ascension, LA
Built 1960 Load: 20.9 t ADT: 8,068
LA0939
GoodOver: BAYOU FRANCOIS
0.8 M SE of US 61, Ascension, LA
Built 1962 Load: 20.9 t ADT: 8,203
Roddy Rd
GoodOver: BERT ALLEN DITCH
0.3 MILES NORTH OF JCT LA, Ascension, LA
Built 2009 Load: 21.4 t ADT: 1,200
US0061
GoodOver: CONWAY CANAL
US0061, Ascension, LA
Built 1954 Load: 22.7 t ADT: 8,171
US0061
GoodOver: AIRLINE DRAINAGE
3.2 M SE of US 61&LA 22, Ascension, LA
Built 1954 Load: 22.7 t ADT: 8,171
US0061
GoodOver: AIRLINE DRAINAGE
1.7 M SE of US 61&LA 22, Ascension, LA
Built 1954 Load: 22.7 t ADT: 8,171
US0061
GoodOver: CANAL
1 M SE of US 61&LA 22, Ascension, LA
Built 1954 Load: 22.7 t ADT: 8,171
E Douglas St
GoodOver: DRAINAGE BAYOU
.10 MILES SOUTH LA 3038, Ascension, LA
Built 1995 Load: 22.7 t ADT: 20
LA0431
GoodOver: BAYOU FRANCOIS
LA0431, Ascension, LA
Built 1958 Load: 23.6 t ADT: 9,608
LA0931
GoodOver: BAYOU MILLET
1.3 M SW of LA 431&LA 931, Ascension, LA
Built 1963 Load: 23.6 t ADT: 4,000
LA0937
GoodOver: ANDERSON CANAL
1.8 M E of LA 22&LA 935, Ascension, LA
Built 1962 Load: 23.6 t ADT: 1,313
LA0928
GoodOver: LA 928 OVER I-10
I0010, Ascension, LA
Built 1975 Load: 23.7 t ADT: 5,446
LA0933
GoodOver: RODDY BAYOU
0.9 Mi. S. of LA 42, Ascension, LA
Built 2007 Load: 24.0 t ADT: 6,131
W Worthy Rd
GoodOver: BAYOU FRANCOIS TRIB.
1.5 MILES WEST OF LA 44, Ascension, LA
Built 2007 Load: 28.2 t ADT: 120
Laurel Ridge Rd
GoodOver: BABIN CANAL
1.8 MI NE LA22-LA429 JCT, Ascension, LA
Built 1988 Load: 28.2 t ADT: 150
Penn Blvd
GoodOver: HENDERSON BAYOU
0.1 M N of LA933, Ascension, LA
Built 1992 Load: 29.2 t ADT: 60
Manchac Acres Rd
GoodOver: Muddy Cr
0.5 Mi. N. of LA 42, Ascension, LA
Built 2022 Load: 30.5 t ADT: 1,139
Churchpoint Rd
GoodOver: BAYOU NARCISSE
0.7 MI SE US61 LA44 JCT, Ascension, LA
Built 2000 Load: 30.8 t ADT: 1,200
Bon Terre Blvd
GoodOver: NEW RIVER BAYOU
1.5 MI E I-10-LA 429 JCT, Ascension, LA
Built 1988 Load: 31.1 t ADT: 75
Roddy Rd
GoodOver: BLACK BAYOU
1.3 MI NE LA 441 US 61JCT, Ascension, LA
Built 1984 Load: 31.4 t ADT: 500
Churchpoint Rd
GoodOver: BAYOU NARCISSE
1.6 MI. E LA44 US61 JCT., Ascension, LA
Built 2000 Load: 31.8 t ADT: 1,200
River Oaks Rd
GoodOver: Darain Bayou
0.3 Mi.N. of LA 73, Ascension, LA
Built 2020 Load: 32.4 t ADT: 30
LA00042
GoodOver: MUDDY CREEK
01.31 MI E OF LA 73, Ascension, LA
Built 2018 Load: 32.4 t ADT: 24,000
US0061
GoodOver: CANAL
0.62 M NW of US 61&LA 22, Ascension, LA
Built 1956 Load: 32.4 t ADT: 14,802
US0061
GoodOver: CANAL
1.2 M NW of US 61&LA 22, Ascension, LA
Built 1956 Load: 32.4 t ADT: 14,802
US0061
GoodOver: CANAL
0.23 M NW of US 61&LA 431, Ascension, LA
Built 1956 Load: 32.4 t ADT: 16,379
LA0044
GoodOver: BOYLE BAYOU
1.00 MI N JCT I-10, Ascension, LA
Built 1980 Load: 32.4 t ADT: 13,914
LA0030
GoodOver: CREEK
1.2 M W of LA 30&LA 3251, Ascension, LA
Built 1968 Load: 32.4 t ADT: 16,790
LA0070
GoodOver: STREAM
1.9 M S of LA 70&LA 22, Ascension, LA
Built 1966 Load: 32.4 t ADT: 24,210
LA0070
GoodOver: STREAM
0.7 M S of LA 70&LA 22, Ascension, LA
Built 1966 Load: 32.4 t ADT: 24,210
I0010
GoodOver: DRAIN
0.2 M S of I-10&LA 74, Ascension, LA
Built 1975 Load: 32.4 t ADT: 60,802
I0010
GoodOver: DRAIN
0.5 M S of I-10&LA 74, Ascension, LA
Built 1975 Load: 32.4 t ADT: 60,802
I0010
GoodOver: DRAIN
1.4 M N of LA 30, Ascension, LA
Built 1975 Load: 32.4 t ADT: 60,802
I0010
GoodOver: DRAIN
1.4 M N of I-10&LA 30, Ascension, LA
Built 1975 Load: 32.4 t ADT: 25,735
I0010
GoodOver: CANAL
0.6 M S of I-10&LA 30, Ascension, LA
Built 1975 Load: 32.4 t ADT: 25,735
I0010
GoodOver: HACKETT CANAL
1.2 M SE of I-10&LA 44, Ascension, LA
Built 1979 Load: 32.4 t ADT: 25,735
I0010
GoodOver: CANAL
0.4 M E of I-10&US 61, Ascension, LA
Built 1969 Load: 32.4 t ADT: 49,274
Spellman Rd
GoodOver: DRAINAGE DITCH
1.5 MI S DUTCHTOWN, Ascension, LA
Built 1988 Load: 32.4 t ADT: 25
Merritt Evans Rd
GoodOver: DRAIN BAYOU
0.7 MI. SE OF LA 44, Ascension, LA
Built 2006 Load: 32.4 t ADT: 250
S Hodgeson Rd
GoodOver: BAYOU CONWAY
0.9 Mi S of LA 30, Ascension, LA
Built 1997 Load: 32.7 t ADT: 150
Aymond Rd
GoodOver: NEW RIVER
2.5 MI NE OF SORRENTO, Ascension, LA
Built 1998 Load: 32.7 t ADT: 25
South Irma Blvd
GoodOver: BAYOU FRANCOIS
0.5 Mi N of LA 939, Ascension, LA
Built 2003 Load: 32.7 t ADT: 1,200
South Irma Blvd
GoodOver: BAYOU FRANCOIS
0.5 Mi N of LA 939, Ascension, LA
Built 2003 Load: 32.7 t ADT: 1,200
I0010
GoodOver: OFF RP TO S US61
I0010, Ascension, LA
Built 1975 Load: 33.6 t ADT: 5,341
N Bryan Ave
GoodOver: NEW RIVER BAYOU
0.5 MILE S. US 61, Ascension, LA
Built 1986 Load: 34.0 t ADT: 25
US0061
GoodOver: BAYOU FRANCOIS
0.85 M SE of US 61&LA 429, Ascension, LA
Built 1976 Load: 34.5 t ADT: 16,379
US0061
GoodOver: NEW RIVER
0.03 M NW of US 61&LA 429, Ascension, LA
Built 1976 Load: 34.5 t ADT: 24,014
Rountree Rd
GoodOver: NEW RIVER
0.2 OF A MILE NORTH OF LA, Ascension, LA
Built 2013 Load: 35.0 t ADT: 5
I0010
GoodOver: NEW RIVER
0.01 Mi S of LA 429, Ascension, LA
Built 1975 Load: 35.4 t ADT: 555
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.