Irr - S 251 over Kirn Coulee
Roosevelt County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr - S 251 over Kirn Coulee in Roosevelt County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 88 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 14 of the 57 inventoried bridges in Roosevelt County rated good (24.6%); 7 (12.3%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (48.36133, -105.08333)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Steel culvert |
| Length | about 29 ft |
| Location | 22M NE Poplar |
| NBI structure number | S00251017+08001 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Roosevelt County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr - US 2 over Mosquito Creek | 1986 | 4,269 | Fair |
| Irr - US 2 over Little Wolf Creek | 1988 | 4,269 | Fair |
| Irr - US 2 over Poplar River | 2000 | 2,296 | Fair |
| S 16 over Sheep Creek | 1970 | 2,129 | Fair |
| Irr - US 2 over Tule Creek | 1958 | 2,054 | Fair |
| Irr - US 2 over Chelsea Creek | 1960 | 2,054 | Poor |
All bridges nearby: Roosevelt County, MT bridge conditions · every bridge in Roosevelt County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.