LA0402 over Bayou Lafourche @ Munson
Assumption Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- LA0402 over Bayou Lafourche @ Munson in Assumption Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1976, making it 49 years old at the 2025 inventory.
- It carries about 551 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 27 of the 68 inventoried bridges in Assumption Parish rated fair (39.7%); 9 (13.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated December 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (29.95542, -91.03045)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete slab |
| Length | about 170 ft |
| Location | LA0402 |
| NBI structure number | 610408041102491 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in Assumption Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US0090 over Ground | 1998 | 12,192 | Good |
| US0090 over West Bound Ramp (off) | 1998 | 12,192 | Good |
| US0090 over East Bound Off Ramp | 1996 | 12,192 | Good |
| US0090 over Westbound on Ramp | 1998 | 12,192 | Good |
| US0090 over Ongoing Ramp B.e. | 1999 | 12,192 | Good |
| US0090 over Offgoing Ramp A.e. | 1999 | 12,192 | Good |
All bridges nearby: Assumption Parish, LA bridge conditions · every bridge in Assumption Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.