Rd 56 over W F Thompson Riv
Sanders County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Rd 56 over W F Thompson Riv in Sanders County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1935, making it 90 years old at the 2025 inventory.
- It carries about 50 vehicles a day.
- It is one of 65 of the 120 inventoried bridges in Sanders County rated fair (54.2%); 10 (8.3%) 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 → (47.64237, -115.17689)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Steel girder and floorbeam |
| Length | about 78 ft |
| Location | Thompson River |
| NBI structure number | 011605000000009 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Sanders County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S 200 over Clark Fork River | 1997 | 3,009 | Fair |
| S 200 over Clark Fork River | 1996 | 3,009 | Fair |
| S 200 over RR | 2000 | 2,686 | Good |
| S 200 over Clark Fork River | 1960 | 2,482 | Poor |
| Irr - S 28 over Hot Springs Creek | 1959 | 2,181 | Fair |
| S 200 over Wildlife Crossing | 2019 | 2,177 | Good |
All bridges nearby: Sanders County, MT bridge conditions · every bridge in Sanders County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.