I 15 over Red Rock Creek
Jefferson County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 15 over Red Rock Creek in Jefferson 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 1984, making it 41 years old at the 2025 inventory.
- It carries about 3,182 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 26 of the 136 inventoried bridges in Jefferson County rated good (19.1%); 7 (5.1%) 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 → (46.26581, -112.31907)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Steel culvert |
| Length | about 21 ft |
| Location | 1M N Bernice |
| NBI structure number | I00015152+09001 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Jefferson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 15 over Prickly Pear Creek | 1969 | 5,987 | Fair |
| I 15 over Prickly Pear Creek | 1969 | 5,987 | Fair |
| S 518 over Int Montana City-i 15 | 1968 | 5,885 | Good |
| I 90 over Int Cardwell-s 359 | 1968 | 5,599 | Fair |
| I 90 over Int Cardwell-s 359 | 1968 | 5,599 | Fair |
| I 90 Eastbound over Boulder River | 1968 | 5,599 | Good |
All bridges nearby: Jefferson County, MT bridge conditions · every bridge in Jefferson County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.