Grants Mill Road over Cahaba River
Jefferson County, Alabama · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Grants Mill Road over Cahaba River in Jefferson 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 1960, making it 65 years old at the 2025 inventory.
- It carries about 7,105 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 836 of the 1,069 inventoried bridges in Jefferson County rated fair (78.2%); 24 (2.2%) 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 July 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 → (33.5109, -86.65255)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 341 ft |
| Location | at Grants Mill |
| NBI structure number | 007150 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | July 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 Alabama department of transportation.
Busiest bridges in Jefferson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I - 20/59 East over I - 20/59 West | 2004 | 157,350 | Good |
| I - 20/59 over Stream | 1973 | 140,400 | Fair |
| I - 65 over 6TH Ave. South | 1970 | 138,490 | Fair |
| I - 65 over 2ND Ave No | 1969 | 136,580 | Fair |
| I - 65 over 4TH. Ave. North | 1969 | 136,580 | Fair |
| I - 65 over 3RD Ave North | 1969 | 136,580 | Fair |
All bridges nearby: Jefferson County, AL bridge conditions · every bridge in Jefferson County · Alabama bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.