Old Hwy 10 W over Clark Fork 054
Mineral County, Montana · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old Hwy 10 W over Clark Fork 054 in Mineral County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1932, making it 93 years old at the 2025 inventory.
- It carries about 356 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 17 of the 153 inventoried bridges in Mineral County rated poor (11.1%); 17 (11.1%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (47.00644, -114.57812)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Steel deck truss |
| Length | about 518 ft |
| Location | 3M W Alberton |
| NBI structure number | L31170000+02001 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Mineral County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Drainage | 1986 | 8,111 | Good |
| I 90 over Sep Local Road | 1973 | 7,824 | Fair |
| I 90 over Sep Local Road | 1973 | 7,824 | Fair |
| I 90 over Int Taft | 1973 | 7,824 | Fair |
| I 90 over Sep Randolph Creek Road | 1973 | 7,824 | Fair |
| I 90 over St. Regis River | 1973 | 7,824 | Fair |
All bridges nearby: Mineral County, MT bridge conditions · every bridge in Mineral County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.