LA0023/John Riley over Drainage Canal
Plaquemines Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- LA0023/John Riley over Drainage Canal in Plaquemines Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1976, making it 49 years old at the 2025 inventory.
- It carries about 526 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 22 of the 35 inventoried bridges in Plaquemines Parish rated fair (62.9%); 7 (20.0%) 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 May 2023, on a 24-month routine inspection cycle.
- 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 → (29.36973, -89.57991)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete slab |
| Length | about 80 ft |
| Location | 48.3 Mi South of La 406 |
| NBI structure number | 023800620510334 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| 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 Plaquemines Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| La 23 over Intercoastal Waterway | 2024 | 39,114 | Good |
| LA0023 over Algiers Outfall C | 1968 | 29,088 | Fair |
| LA0023 over I C Waterway | 1968 | 29,088 | Fair |
| LA0023 over Bayou Barriere | 1955 | 29,088 | Fair |
| LA0023 over Algiers Outfall Canal | 1968 | 25,594 | Fair |
| LA0023 over Bayou Barriere | 1968 | 25,594 | Fair |
All bridges nearby: Plaquemines Parish, LA bridge conditions · every bridge in Plaquemines Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.