Ky-3439 over Shy Mug Branch
Knox County, Kentucky · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ky-3439 over Shy Mug Branch in Knox County, Kentucky, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1960, making it 65 years old at the 2025 inventory.
- It carries about 2,121 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 91 of the 125 inventoried bridges in Knox County rated fair (72.8%); 9 (7.2%) are rated poor.
- 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 → (36.87333, -83.83333)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 5 | Fair condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 24 ft |
| Location | .1 Mi W-ky 1304 @yeager |
| NBI structure number | 061B00087N |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Kentucky department of transportation.
Busiest bridges in Knox County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-25E over Fighting Creek | 1979 | 17,457 | Fair |
| South US 25E over Little Richland Creek | 1979 | 8,489 | Fair |
| US-25E over Little Richland Creek | 1979 | 8,489 | Fair |
| Ky 3041 over Ky 1232 CSX RR Lynn Camp | 1993 | 7,935 | Fair |
| South US 25E over Big Richland Creek | 1979 | 7,739 | Fair |
| US-25E over Big Richland Creek | 1979 | 7,739 | Fair |
All bridges nearby: Knox County, KY bridge conditions · every bridge in Knox County · Kentucky bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.