US0090 over La 318
St. Mary Parish, Louisiana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US0090 over La 318 in St. Mary Parish, Louisiana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2017, making it 8 years old at the 2025 inventory.
- It carries about 8,073 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 36 of the 124 inventoried bridges in St. Mary Parish rated good (29.0%); 9 (7.3%) 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 August 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (29.86771, -91.63622)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete stringer or multi-beam girder |
| Length | about 1,887 ft |
| Location | 3.1 Mi E of La 668 |
| NBI structure number | 035100000030508 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in St. Mary Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US0090 over Ramp I | 1984 | 24,384 | Good |
| US0090 over Ramp M | 1984 | 24,384 | Good |
| US0090 over Patterson Canal | 1964 | 22,893 | Good |
| US0090 over Charenton Canal | 1978 | 21,000 | Fair |
| US0090 over Drain | 1973 | 18,127 | Fair |
| US0090 over Barrow Canal | 1964 | 17,736 | Fair |
All bridges nearby: St. Mary Parish, LA bridge conditions · every bridge in St. Mary Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.