I 90 over RR
FairMissoula County, Montana · 5M W Missoula · Structure no. I00090096+09852
- Built
- 1966
- 59 years old, rebuilt 1986
- Condition
- Fair
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 163 ft
- 3 main spans
- Daily traffic
- 10,499
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over RR is a prestressed concrete stringer/multi-beam or girder carrying I 90 over RR in Missoula County, Montana. It was built in 1966 and reconstructed in 1986, so it is 59 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 10,499 vehicles a day, roughly 11% of them trucks, projected to reach 11,024 by 2043. The structure is 163 ft (49.7 m) long and 39 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over RR built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1986.
What condition is I 90 over RR 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 December 2023.
How much traffic does I 90 over RR carry?
About 10,499 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is I 90 over RR?
The structure is 163 ft (49.7 m) long with a longest span of 56 ft (17.1 m) and a deck 39 ft wide.
Who owns I 90 over RR?
It is owned by the State Highway Agency.