Irr - S 39 over Sheep Creek
Rosebud County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr - S 39 over Sheep Creek in Rosebud County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1982, making it 43 years old at the 2025 inventory.
- It carries about 787 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 87 of the 112 inventoried bridges in Rosebud County rated fair (77.7%); 7 (6.2%) 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 → (46.08806, -106.74397)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 46 ft |
| Location | 16M NW Colstrip |
| NBI structure number | P00039038+06861 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Rosebud County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr Bia Rte 6 over Lame Deer Creek | 1976 | 3,000 | Good |
| I 94 over Int East Forsyth | 1977 | 2,749 | Fair |
| I 94 over Int East Forsyth | 1977 | 2,749 | Fair |
| I 94 over Int W Rosebud 446-447 | 1970 | 2,636 | Fair |
| I 94 over Int W Rosebud 446-447 | 1970 | 2,636 | Fair |
| I 94 over Rosebud Creek | 1970 | 2,636 | Fair |
All bridges nearby: Rosebud County, MT bridge conditions · every bridge in Rosebud County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.