4-Mile Bayou Rd over Canal
St. Martin Parish, Louisiana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 4-Mile Bayou Rd over Canal in St. Martin 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 2020, making it 5 years old at the 2025 inventory.
- It carries about 105 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 46 of the 117 inventoried bridges in St. Martin Parish rated good (39.3%); 10 (8.5%) 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 October 2024, 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 → (29.82853, -91.14742)
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 | Timber stringer or multi-beam girder |
| Length | about 76 ft |
| Location | 6.1 Mi. E. of LA 70 |
| NBI structure number | 035000000035003 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| 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. Martin Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US0090 over Creek | 1965 | 62,432 | Fair |
| Sawmill Rd over I-10 | 1970 | 60,066 | Good |
| I0010 over Atchafalaya River | 1972 | 56,100 | Fair |
| I0010-e over La 328 | 2020 | 50,425 | Good |
| I0010 over Bayou Teche | 1970 | 50,425 | Good |
| I0010 over E Atchafalaya Floodway | 1972 | 42,449 | Fair |
All bridges nearby: St. Martin Parish, LA bridge conditions · every bridge in St. Martin Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.