Total bridges
68
Public highway bridges in Assumption County
County profile · official public datasets
Assumption County, LA
68 public highway bridges tracked in the FHWA National Bridge Inventory: 48.5% rated Good, 41.2% Fair, 10.3% Poor.
- 68
- Public bridges
- 48.5%
- Good condition
- 10.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Assumption County posts a better-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 50%
- lowest Poor share in state
- 10.3%
- Poor-condition share
- 68
- public highway bridges
- 1984
- 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.
Assumption County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Assumption County ranks #32 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.3%). Assumption County, Louisiana contains 68 public highway bridges. Roughly 48.5% are rated “Good,” 41.2% “Fair,” and 10.3% “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
48.5%
33 of 68 rated 7-9
Fair condition
41.2%
28 of 68 rated 5-6
Poor condition
10.3%
7 of 68 rated 4 or below
In-state Poor-share rank
#32 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 68 NBI-tracked bridges by lowest applicable component rating.
Good 48.5% (33)
Fair 41.2% (28)
Poor 10.3% (7)
Assumption County's Poor-condition bridges carry 11,901 vehicle crossings a day
That is 3.5% of the county's reported daily bridge traffic on 10.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,700 crossings a day against 6,620 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 68 of 68 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.8% of Assumption County's bridges have passed the 50-year mark
23 of the 68 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 48.5% 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 46.7% of the county's Poor-condition bridge traffic
LA0070 over PIERRE PASS, built 1967, carries 5,560 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 7-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 11,901 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Assumption County's bridges were built
68 bridges with a recorded construction year, grouped by decade
- 1950s 8
1950–1959
8 bridges
- 1960s 7
1960–1969
7 bridges
- 1970s
1970–1979
21 bridges
- 1980s 7
1980–1989
7 bridges
- 1990s
1990–1999
11 bridges
- 2000s 7
2000–2009
7 bridges
- 2010s 6
2010–2019
6 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1970s, when 21 of the county's bridges still in the inventory were built, which is 30.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1984) matches the Louisiana average (1982).
How Assumption County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Assumption County in number of bridges, with their condition splits. Its 10.3% Poor share is the 2nd-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1979 is 5 years newer.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Iberville County | 80 | 33.8% | 51.3% | 15% | 1975 |
| West Baton Rouge County | 73 | 32.9% | 52.1% | 15.1% | 1969 |
| Catahoula County | 70 | 45.7% | 45.7% | 8.6% | 1984 |
| Assumption County (this page) | 68 | 48.5% | 41.2% | 10.3% | 1984 |
| Red River County | 63 | 22.2% | 47.6% | 30.2% | 1982 |
| Cameron County | 58 | 19% | 55.2% | 25.9% | 1985 |
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 Assumption 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 Assumption County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (68 bridges here).
- Bent County, CO · 68 bridges
- Columbia County, GA · 68 bridges
- Talbot County, GA · 68 bridges
- Wilcox County, GA · 68 bridges
Similar average build year
Nearest mean year-built outside LA (1984 here).
- Hennepin County, MN · avg 1984 · 936 bridges
- Duval County, FL · avg 1984 · 831 bridges
- El Paso County, CO · avg 1984 · 686 bridges
- Bell County, TX · avg 1984 · 660 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (33)
LA0070
GoodOver: BELLE RIVER
0.01 Mi. S. of LA 1016-2, Assumption, LA
Built 2009 Load: 14.6 t ADT: 8,005
LA0070
GoodOver: BAYOU CHOUPIQUE
0.4 M E of LA 69&LA 70, Assumption, LA
Built 1958 Load: 18.8 t ADT: 5,760
LA1016-1
GoodOver: BAYOU VERRET
2 Mi E of LA 70, Assumption, LA
Built 2010 Load: 22.0 t ADT: 192
LA0070
GoodOver: BAYOU CORNE
LA0070, Assumption, LA
Built 1960 Load: 22.7 t ADT: 6,842
LA0070
GoodOver: BAYOU VALERIE
2.5 M W of LA 69&LA 70, Assumption, LA
Built 1960 Load: 22.7 t ADT: 6,842
Lee Dr
GoodOver: BAYOU PIERRE PART
1.1 MILES S/W OF LA 70, Assumption, LA
Built 2007 Load: 23.3 t ADT: 672
US0090
GoodOver: WESTBOUND ON RAMP
0.1 M E of US 90&LA 662, Assumption, LA
Built 1998 Load: 25.3 t ADT: 12,192
Aristile Rd
GoodOver: BAYOU LAROUSE
ARISTILE RD 0.5 MI E. OF, Assumption, LA
Built 2012 Load: 25.4 t ADT: 1,720
US0090
GoodOver: ONGOING RAMP B.E.
6 Mi E of LA 182/90, Assumption, LA
Built 1999 Load: 28.8 t ADT: 12,192
US0090
GoodOver: GROUND
1.0 M W of US 90&LA 662, Assumption, LA
Built 1998 Load: 29.2 t ADT: 12,192
US0090
GoodOver: OFFGOING RAMP A.E.
2.56 Mi W of La 662 Exit, Assumption, LA
Built 1999 Load: 29.8 t ADT: 12,192
LA0070
GoodOver: DRAIN
2.7 M NE of LA 1&LA 70, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070
GoodOver: DRAIN
2.7 M NE of LA 1&LA 70, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070
GoodOver: DRAIN
3.1 M NE of LA 1&LA 70, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070
GoodOver: SEATRA CANAL
3.3 M SW of LA 70&LA 3127, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070
GoodOver: DRAIN
2.6 M SW of LA 70&LA 3127, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070
GoodOver: DRAIN
3.26 MI. NE OF LA 70 SPUR, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070
GoodOver: DRAIN
0.8 M SW of LA 70&LA 3127, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0070-S
GoodOver: DRAIN
0.3 M SW of LA 70&LA 3127, Assumption, LA
Built 1977 Load: 32.4 t ADT: 11,166
LA0663
GoodOver: LOURSE BAYOU
0.1 MILE EAST OF LA. 662, Assumption, LA
Built 2015 Load: 33.4 t ADT: 96
LA0070
GoodOver: LIT BAU PIERRE PA
LA0070, Assumption, LA
Built 1960 Load: 36.3 t ADT: 6,842
US0090
GoodOver: WEST BOUND RAMP (OFF)
1.0 M W of US 90&LA 662, Assumption, LA
Built 1998 Load: 37.2 t ADT: 12,192
LA 400
GoodOver: CANCIENNE CANAL
4.2 MILES NORTHWEST OF LA, Assumption, LA
Built 2013 Load: 37.6 t ADT: 384
Hardtime Rd
GoodOver: CANCIENNE CANAL
3 MILES SOUTH OF NAPOLEON, Assumption, LA
Built 2006 Load: 38.9 t ADT: 60
US0090
GoodOver: EAST BOUND OFF RAMP
0.2 M E of US 90&LA 662, Assumption, LA
Built 1996 Load: 40.8 t ADT: 12,192
LA1012
GoodOver: HIMALAYA CANAL
1.5 MILES SOUTH OF LA 101, Assumption, LA
Built 2014 Load: 46.3 t ADT: 96
US0090
GoodOver: DRAIN
0.2 MI E of LA 662, Assumption, LA
Built 2006 Load: 46.3 t ADT: 3,440
LA0182
GoodOver: BAYOU CAROLINE
0.7 Miles E of US90 Bus, Assumption, LA
Built 2006 Load: 46.3 t ADT: 3,905
LA0182
GoodOver: ALLIGATOR BAYOU
1.3 MI E of US 90 BUS, Assumption, LA
Built 2006 Load: 46.3 t ADT: 3,905
LA0182
GoodOver: ALLIGATOR BAYOU RELIEF
1.3 Miles W of LA 662, Assumption, LA
Built 2006 Load: 46.3 t ADT: 3,905
LA0662
GoodOver: PUMPING STATION BRIDGE
2.04 MI N OF END OF LA662, Assumption, LA
Built 1998 Load: 48.1 t ADT: 2,905
St Vincent Rd
GoodOver: SAINT VINCENT BAYOU
0.4 MI S OF LA 402, Assumption, LA
Built 2015 Load: 48.3 t ADT: 96
Bayou Crab Rd
GoodOver: Norman Canal
0.8 Mi. E. of LA 401, Assumption, LA
Built 2022 Load: 51.8 t ADT: 316
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.