I 90 over Int Nine Mile
FairMissoula County, Montana · 6.8M W Frenchtown · Structure no. I00090082+06231
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 124 ft
- 3 main spans
- Daily traffic
- 5,499
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Int Nine Mile is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int Nine Mile in Missoula County, Montana. It was built in 1964, so it is 61 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 5,499 vehicles a day, roughly 17% of them trucks, projected to reach 5,773 by 2043. The structure is 124 ft (37.8 m) long and 38 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Int Nine Mile built?
It was built in 1964, making it 61 years old in 2025.
What condition is I 90 over Int Nine Mile 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 May 2024.
How much traffic does I 90 over Int Nine Mile carry?
About 5,499 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is I 90 over Int Nine Mile?
The structure is 124 ft (37.8 m) long with a longest span of 41 ft (12.5 m) and a deck 38 ft wide.
Who owns I 90 over Int Nine Mile?
It is owned by the State Highway Agency.