I0055 over Pass Manchac
Tangipahoa Parish, Louisiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I0055 over Pass Manchac in Tangipahoa Parish, Louisiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1977, making it 48 years old at the 2025 inventory.
- It carries about 14,300 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 228 of the 477 inventoried bridges in Tangipahoa Parish rated fair (47.8%); 59 (12.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (substructure 7 to 6).
- Its most recent inspection on record is dated May 2023, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (30.28948, -90.40273)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 3,051 ft |
| Location | 11.0 M S of La 22 |
| NBI structure number | 625304529000002 |
| 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) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Louisiana department of transportation.
Busiest bridges in Tangipahoa Parish
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I0012 over Yellow Water River Rel. | 1970 | 58,377 | Good |
| I0012 over I-55 | 1970 | 58,377 | Fair |
| I0012 over Drainage | 1970 | 58,377 | Fair |
| I0012 over US 51 Bus | 1975 | 58,377 | Fair |
| I0012 over Icg Railroad | 1975 | 58,377 | Fair |
| I0012 over Ponchatoula Creek | 1975 | 58,377 | Fair |
All bridges nearby: Tangipahoa Parish, LA bridge conditions · every bridge in Tangipahoa Parish · Louisiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.