I 90 over Clark Fork River
FairPowell County, Montana · 1.2M S Deer Lodge · Structure no. I00090187+06891
- Built
- 1961
- 64 years old, rebuilt 1992
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 153 ft
- 3 main spans
- Daily traffic
- 5,354
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Clark Fork River is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Clark Fork River in Powell County, Montana. It was built in 1961 and reconstructed in 1992, so it is 64 years old, older 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 5,354 vehicles a day, roughly 17% of them trucks, projected to reach 5,809 by 2043. The structure is 153 ft (46.6 m) long and 45 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Clark Fork River built?
It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1992.
What condition is I 90 over Clark Fork 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 September 2024.
How much traffic does I 90 over Clark Fork River carry?
About 5,354 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is I 90 over Clark Fork River?
The structure is 153 ft (46.6 m) long with a longest span of 50 ft (15.2 m) and a deck 45 ft wide.
Who owns I 90 over Clark Fork River?
It is owned by the State Highway Agency.