US 421 over Trib to Town Branch
Trimble County, Kentucky · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 421 over Trib to Town Branch in Trimble 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 1984, making it 41 years old at the 2025 inventory.
- It carries about 2,170 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 3 of the 46 inventoried bridges in Trimble County rated good (6.5%); 4 (8.7%) 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 October 2021, on a 48-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 → (38.585, -85.30861)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 24 ft |
| Location | 0.75 Mi S of US 42 |
| NBI structure number | 112B00025N |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2021 |
| Inspection interval (item 91) | 48 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 Trimble County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 421 over Ohio River | 2014 | 8,975 | Fair |
| US 421 Escape Ramp over Tiber Creek | 1989 | 5,533 | Fair |
| Ky 36 over Canip Creek | 1933 | 3,978 | Poor |
| US 421 over Little Kentucky River | 1982 | 2,170 | Fair |
| US 421 over Town Branch | 1984 | 2,170 | Fair |
| US 42 over Trib to Little Ky River | 1931 | 1,493 | Fair |
All bridges nearby: Trimble County, KY bridge conditions · every bridge in Trimble County · Kentucky bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.