I 90 over Dempsey Creek
Powell County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 90 over Dempsey Creek in Powell 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 1973, making it 52 years old at the 2025 inventory.
- It carries about 10,708 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 70 of the 113 inventoried bridges in Powell County rated fair (61.9%); 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 → (46.31298, -112.74538)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 29 ft |
| Location | N Sager Lane Overpass |
| NBI structure number | I00090192+03001 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Powell County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Jr Grade Sep | 1961 | 10,463 | Fair |
| I 90 over Jr Grade Sep | 1961 | 10,463 | Fair |
| I 90 over Int Jens | 1959 | 5,992 | Fair |
| I 90 over Int Jens | 1959 | 5,992 | Fair |
| I 90 EB over Int Gold Creek | 1959 | 5,992 | Fair |
| I 90 WB over Int Gold Creek | 1959 | 5,992 | Fair |
All bridges nearby: Powell County, MT bridge conditions · every bridge in Powell County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.