I 90 over Keyser Creek
FairStillwater County, Montana · 1.2M W Columbus · Structure no. I00090407+08622
- Built
- 1971
- 54 years old, rebuilt 2014
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 191 ft
- 3 main spans
- Daily traffic
- 5,861
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Keyser Creek is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Keyser Creek in Stillwater County, Montana. It was built in 1971 and reconstructed in 2014, so it is 54 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 5,861 vehicles a day, roughly 18% of them trucks, projected to reach 6,300 by 2043. The structure is 191 ft (58.2 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Keyser Creek built?
It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2014.
What condition is I 90 over Keyser Creek 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 November 2023.
How much traffic does I 90 over Keyser Creek carry?
About 5,861 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is I 90 over Keyser Creek?
The structure is 191 ft (58.2 m) long with a longest span of 76 ft (23.3 m) and a deck 44 ft wide.
Who owns I 90 over Keyser Creek?
It is owned by the State Highway Agency.