US 12 over Sandstone Creek
Fallon County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 12 over Sandstone Creek in Fallon County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1971, making it 54 years old at the 2025 inventory.
- It carries about 498 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 19 of the 38 inventoried bridges in Fallon County rated fair (50.0%); 2 (5.3%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 7 to 6, substructure 6 to 7.
- Its most recent inspection on record is dated October 2024, 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 → (46.41447, -104.57094)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 142 ft |
| Location | 2M W Plevna |
| NBI structure number | P00002067+09361 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Fallon County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Lake St over Baker Lake Overflow | 2009 | 2,393 | Good |
| S 7-main St N over Sandstone Creek | 1941 | 2,209 | Poor |
| US 12 over Drainage | 1998 | 1,600 | Fair |
| US 12 over Timber Creek | 1998 | 825 | Fair |
| US 12 over Sandstone Creek | 1998 | 753 | Fair |
| US 12 over RR | 1968 | 696 | Fair |
All bridges nearby: Fallon County, MT bridge conditions · every bridge in Fallon County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.