LA8406 over Bayou Desiard
Ouachita Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- LA8406 over Bayou Desiard in Ouachita Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1995, making it 30 years old at the 2025 inventory.
- It carries about 15,737 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 211 of the 331 inventoried bridges in Ouachita Parish rated fair (63.7%); 42 (12.7%) 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 → (32.54331, -92.0947)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete slab |
| Length | about 439 ft |
| Location | 2.67 MI NE of N 18TH ST |
| NBI structure number | 053708370402671 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in Ouachita Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| 18TH St at Desiard over Drainage Canal | 1996 | 100,000 | Good |
| I0020 over Black Bayou | 1965 | 84,225 | Fair |
| I0020 over City St/icg Rr/ouachita | 1965 | 84,225 | Fair |
| I0020 over Youngs Bayou | 1965 | 84,225 | Fair |
| I0020 over US 165 | 1965 | 84,225 | Fair |
| I0020 over E Youngs Bayou | 1965 | 84,225 | Fair |
All bridges nearby: Ouachita Parish, LA bridge conditions · every bridge in Ouachita Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.