I 90 over Rattlesnake Cr-Int Ramp
FairMissoula County, Montana · Missoula · Structure no. I00090105+04673
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 225 ft
- 4 main spans
- Daily traffic
- 2,799
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Rattlesnake Cr-Int Ramp is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Rattlesnake Cr-Int Ramp in Missoula County, Montana. It was built in 1966, 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 5 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 2,799 vehicles a day, roughly 3% of them trucks, projected to reach 2,966 by 2043. The structure is 225 ft (68.5 m) long and 26 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Rattlesnake Cr-Int Ramp built?
It was built in 1966, making it 59 years old in 2025.
What condition is I 90 over Rattlesnake Cr-Int Ramp 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 October 2024.
How much traffic does I 90 over Rattlesnake Cr-Int Ramp carry?
About 2,799 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is I 90 over Rattlesnake Cr-Int Ramp?
The structure is 225 ft (68.5 m) long with a longest span of 87 ft (26.4 m) and a deck 26 ft wide.
Who owns I 90 over Rattlesnake Cr-Int Ramp?
It is owned by the State Highway Agency.