US 421 over Trib to Flat Creek
Franklin County, Kentucky · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 421 over Trib to Flat Creek in Franklin County, Kentucky, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2016, making it 9 years old at the 2025 inventory.
- It carries about 787 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- It is one of 15 of the 117 inventoried bridges in Franklin County rated good (12.8%); 13 (11.1%) 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 July 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (38.31111, -84.94139)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 23 ft |
| Location | 2.9 Mi N of Ky 12 |
| NBI structure number | 037B00107N |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| 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 Kentucky department of transportation.
Busiest bridges in Franklin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-64 & Ky 2817 over Trib to S Benson Creek | 1960 | 43,091 | Fair |
| I-64 over Ky 1665 | 2024 | 43,091 | Good |
| I-64 over Ky 2817 | 2024 | 43,091 | Fair |
| I-64 over Hickman Branch | 1972 | 38,908 | Fair |
| US 60 over Rj Corman Railroad | 1960 | 27,413 | Fair |
| US 60 over Ky 676 (e-w Conn) | 1978 | 27,413 | Fair |
All bridges nearby: Franklin County, KY bridge conditions · every bridge in Franklin County · Kentucky bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.