US 12 over Willow Creek
Musselshell County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 12 over Willow Creek in Musselshell County, Montana, 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 1999, making it 26 years old at the 2025 inventory.
- It carries about 712 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 11 of the 28 inventoried bridges in Musselshell County rated fair (39.3%); 1 (3.6%) 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 → (46.47008, -108.44038)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 21 ft |
| Location | 4M NE Roundup |
| NBI structure number | P00014174+06061 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Musselshell County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 87 over Musselshell River | 1996 | 2,799 | Good |
| US 87 over Park Coulee | 1995 | 2,548 | Good |
| US 87 over Razor Creek | 1995 | 2,548 | Good |
| US 87 over South Willow Creek | 1976 | 1,223 | Good |
| US 12 over Drainage | 2003 | 480 | Good |
| US 12 over Dean Creek | 1935 | 441 | Fair |
All bridges nearby: Musselshell County, MT bridge conditions · every bridge in Musselshell County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.