Boulder Rd over Boulder River 002
Sweet Grass County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Boulder Rd over Boulder River 002 in Sweet Grass 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 1931 and reconstructed in 1991, making it 94 years old at the 2025 inventory.
- It carries about 157 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 58 of the 94 inventoried bridges in Sweet Grass County rated fair (61.7%); 6 (6.4%) 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 → (45.40386, -110.19221)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Steel through truss |
| Length | about 111 ft |
| Location | 19M S Mcleod |
| NBI structure number | L49102007+01001 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Sweet Grass County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Spring Creek | 1980 | 12,306 | Fair |
| I 90 over Work Creek | 1972 | 10,845 | Fair |
| I 90 over Upper Deer Creek | 1980 | 6,153 | Fair |
| I 90 over Upper Deer Creek | 1980 | 6,153 | Fair |
| I 90 over Lower Deer Creek | 1980 | 6,153 | Fair |
| I 90 over Lower Deer Creek | 1980 | 6,153 | Good |
All bridges nearby: Sweet Grass County, MT bridge conditions · every bridge in Sweet Grass County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.