LA0311 over Little Bayou Black
Terrebonne Parish, Louisiana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- LA0311 over Little Bayou Black in Terrebonne Parish, Louisiana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1951, making it 74 years old at the 2025 inventory.
- It carries about 11,582 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 91 of the 214 inventoried bridges in Terrebonne Parish rated good (42.5%); 22 (10.3%) are rated poor.
- 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 → (29.59121, -90.7429)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 40 ft |
| Location | 1.15 Mi South of La 312 |
| NBI structure number | 025504130101131 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in Terrebonne Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| LA0024 over Bayou Terrebonne | 2006 | 30,800 | Fair |
| LA0024 over Intracoastal Waterway | 1996 | 29,371 | Good |
| LA0024 over Sprr & La 20 | 1970 | 28,505 | Fair |
| LA0024 over Cane Bayou | 1960 | 23,871 | Good |
| LA0024 over Bayou Terrebonne | 1998 | 22,400 | Good |
| LA0024 over Intracoastal Waterway | 1996 | 20,358 | Good |
All bridges nearby: Terrebonne Parish, LA bridge conditions · every bridge in Terrebonne Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.