I0055 over Swamp
St. John the Baptist Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I0055 over Swamp in St. John the Baptist Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 27,551 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 26 of the 40 inventoried bridges in St. John the Baptist Parish rated fair (65.0%); 1 (2.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (substructure 7 to 6).
- Its most recent inspection on record is dated June 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 → (30.14953, -90.44918)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 128 ft |
| Location | 4.50 Miles North of Jct I |
| NBI structure number | 624800000620249 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in St. John the Baptist Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I0010 over US 51 & Swamps | 1972 | 48,723 | Fair |
| I0010 over Hope Canal | 1975 | 44,074 | Fair |
| I0010 over Mississippi Bayou | 1975 | 44,074 | Fair |
| I0010 over Reserve Relief Canal | 1974 | 44,074 | Fair |
| I0055 over Swamp | 1975 | 28,021 | Good |
| I0055 over Swamp | 2008 | 27,551 | Fair |
All bridges nearby: St. John the Baptist Parish, LA bridge conditions · every bridge in St. John the Baptist Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.