Stephen Lyon Road over Porter Bayou
Sunflower County, Mississippi · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Stephen Lyon Road over Porter Bayou in Sunflower 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 1992, making it 33 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 52 of the 169 inventoried bridges in Sunflower County rated fair (30.8%); 44 (26.0%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated December 2024, 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 → (33.52707, -90.67018)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel |
| Length | about 132 ft |
| Location | Sec 1 T19N R 5W |
| NBI structure number | SA6700000000069 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | December 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Mississippi department of transportation.
Busiest bridges in Sunflower County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 82 over Moorehead Bayou | 1978 | 8,000 | Fair |
| SR 8 over Dougherly Bayou | 1940 | 7,900 | Fair |
| SR 3 over Canal | 1947 | 4,600 | Fair |
| US 49W over Ditch | 1992 | 4,000 | Good |
| US 82 over Sunflower River | 1933 | 4,000 | Poor |
| US 82 over Sunflower River | 1976 | 4,000 | Fair |
All bridges nearby: Sunflower County, MS bridge conditions · every bridge in Sunflower County · Mississippi bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.