US 49 over Big Biloxi River
Harrison County, Mississippi · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 49 over Big Biloxi River in Harrison County, Mississippi, 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 1959, making it 66 years old at the 2025 inventory.
- It carries about 8,500 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 126 of the 302 inventoried bridges in Harrison County rated fair (41.7%); 17 (5.6%) 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 → (30.55795, -89.12179)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 540 ft |
| Location | 9.0 Mi N I 10 |
| NBI structure number | 21000490240138B |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Mississippi department of transportation.
Busiest bridges in Harrison County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 10 over Stream | 1969 | 75,000 | Good |
| I 10 over Stream | 1969 | 66,000 | Fair |
| I 10 over Flat Branch | 1969 | 53,000 | Good |
| I 10 over Delisle Bayou | 1969 | 49,000 | Good |
| I 10 over Parker Creek | 1970 | 47,000 | Good |
| I 10 over Parker Creek | 1970 | 47,000 | Good |
All bridges nearby: Harrison County, MS bridge conditions · every bridge in Harrison County · Mississippi bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.