Ky-3170 over Marshall Branch
Mason County, Kentucky · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ky-3170 over Marshall Branch in Mason County, Kentucky, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1957, making it 68 years old at the 2025 inventory.
- It carries about 292 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 59 of the 97 inventoried bridges in Mason County rated fair (60.8%); 8 (8.2%) 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 November 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 → (38.54889, -83.76417)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 28 ft |
| Location | .05 Mi W of Jct New Ky 11 |
| NBI structure number | 081B00007N |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | November 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 Kentucky department of transportation.
Busiest bridges in Mason County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ky-9 over Lawrence Creek | 1983 | 12,217 | Good |
| US-62X over Limestone Creek | 1954 | 10,454 | Fair |
| US-62X over Limestone Creek | 1963 | 9,230 | Fair |
| Ky-9 over Trans-ky Trans.rr | 1988 | 7,844 | Fair |
| Ky-11 over Limestone Creek | 1960 | 6,346 | Fair |
| Ky-11 over Mill Creek | 1991 | 6,346 | Fair |
All bridges nearby: Mason County, KY bridge conditions · every bridge in Mason County · Kentucky bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.