I 90 over Little Blackfoot River
FairPowell County, Montana · 1.2M S Garrison · Structure no. I00090175+02151
- Built
- 1979
- 46 years old
- Condition
- Fair
- inspected January 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 133 ft
- 2 main spans
- Daily traffic
- 5,232
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Little Blackfoot River is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Little Blackfoot River in Powell County, Montana. It was built in 1979, so it is 46 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 5,232 vehicles a day, roughly 20% of them trucks, projected to reach 5,650 by 2043. The structure is 133 ft (40.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Little Blackfoot River built?
It was built in 1979, making it 46 years old in 2025.
What condition is I 90 over Little Blackfoot River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.
How much traffic does I 90 over Little Blackfoot River carry?
About 5,232 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is I 90 over Little Blackfoot River?
The structure is 133 ft (40.4 m) long with a longest span of 65 ft (19.8 m) and a deck 44 ft wide.
Who owns I 90 over Little Blackfoot River?
It is owned by the State Highway Agency.