I 15 over S Pondera Coulee
Pondera County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 15 over S Pondera Coulee in Pondera 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 1964, making it 61 years old at the 2025 inventory.
- It carries about 3,248 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 43 of the 96 inventoried bridges in Pondera County rated fair (44.8%); 4 (4.2%) 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 → (48.07228, -111.85844)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 46 ft |
| Location | 3M N Brady |
| NBI structure number | I00015331+00001 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Pondera County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 15 over RR | 1972 | 1,727 | Good |
| I 15 over RR | 1972 | 1,727 | Good |
| I 15 over Dry Fork Marias River | 1972 | 1,727 | Good |
| I 15 over Dry Fork Marias River | 1972 | 1,727 | Good |
| S 21 over RR | 1972 | 1,725 | Good |
| I 15 over Pondera Canal | 1972 | 1,510 | Fair |
All bridges nearby: Pondera County, MT bridge conditions · every bridge in Pondera County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.