Irr - S 13 over Drainage-stockpass
McCone County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr - S 13 over Drainage-stockpass in McCone 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 1995, making it 30 years old at the 2025 inventory.
- It carries about 985 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 5 of the 43 inventoried bridges in McCone County rated good (11.6%); 4 (9.3%) 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 → (47.99481, -105.51761)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Steel culvert |
| Length | about 20 ft |
| Location | 11M N Vida |
| NBI structure number | P00025041+03001 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in McCone County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S 200 over Redwater River | 1933 | 1,263 | Fair |
| Irr - S 13 over Drainage | 1995 | 985 | Fair |
| Irr - S 13 over Nickwall Creek | 1995 | 985 | Fair |
| S 200S over Buffalo Spring Creek | 1966 | 971 | Fair |
| S 13 over Horse Creek | 1988 | 910 | Fair |
| S 13 over Lost Creek | 1988 | 910 | Fair |
All bridges nearby: McCone County, MT bridge conditions · every bridge in McCone County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.