S 340 over Plum Coulee Creek
Prairie County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- S 340 over Plum Coulee Creek in Prairie County, Montana, 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 2020, making it 5 years old at the 2025 inventory.
- It carries about 162 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 4 of the 46 inventoried bridges in Prairie County rated good (8.7%); 5 (10.9%) are rated poor.
- 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 → (46.82806, -105.10517)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 29 ft |
| Location | 1M SE Fallon |
| NBI structure number | 000000202006689 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Prairie County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 94 over Ash Creek | 1969 | 3,878 | Fair |
| I 94 over Int Powder River | 1971 | 3,045 | Fair |
| I 94 over RR | 1977 | 2,219 | Fair |
| I 94 over Yellowstone River | 1978 | 2,219 | Fair |
| I 94 over Yellowstone River | 1978 | 2,219 | Fair |
| I 94 over Sep Montana Road | 1971 | 2,137 | Fair |
All bridges nearby: Prairie County, MT bridge conditions · every bridge in Prairie County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.