US 431; SR1; SR79 over Tennessee River
Marshall County, Alabama · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 431; SR1; SR79 over Tennessee River in Marshall County, Alabama, 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 1977, making it 48 years old at the 2025 inventory.
- It carries about 9,481 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 92 of the 171 inventoried bridges in Marshall County rated fair (53.8%); 15 (8.8%) 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 April 2023, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (34.368, -86.28893)
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 | Continuous steel girder and floorbeam |
| Length | about 2,853 ft |
| Location | City of Guntersville |
| NBI structure number | 011785 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alabama department of transportation.
Busiest bridges in Marshall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 431 over Guntersville Lake | 1938 | 35,218 | Fair |
| US 431 over Turkey Creek | 1952 | 31,175 | Fair |
| US 431 over Drum Creek | 1952 | 30,151 | Fair |
| US 431 over Branch | 1930 | 16,982 | Fair |
| SR 69 over Browns Creek | 1941 | 15,881 | Fair |
| SR 69 over Branch | 1934 | 12,904 | Good |
All bridges nearby: Marshall County, AL bridge conditions · every bridge in Marshall County · Alabama bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.