LA0642 over Marvin Canal
St. James Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- LA0642 over Marvin Canal in St. James Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1979, making it 46 years old at the 2025 inventory.
- It carries about 410 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 17 of the 26 inventoried bridges in St. James Parish rated fair (65.4%); 1 (3.8%) are rated poor.
- 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 → (30.04484, -90.7518)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Concrete slab |
| Length | about 57 ft |
| Location | 0.6 M W of LA 3125 |
| NBI structure number | 614708470101101 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in St. James Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I0010 over Blind River | 1975 | 49,274 | Fair |
| I0010 over Blind River | 1975 | 29,510 | Fair |
| LA0070 over Mississippi River | 1963 | 17,100 | Fair |
| US0061 over Tchackchou Bayou | 1978 | 14,957 | Good |
| US0061 over Blind River | 1977 | 14,957 | Fair |
| US0061 over Drain Canal | 1978 | 14,957 | Good |
All bridges nearby: St. James Parish, LA bridge conditions · every bridge in St. James Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.