I 90 over Int West Big Timber
GoodSweet Grass County, Montana · 1.2M W Big Timber · Structure no. I00090367+05231
- Built
- 1981
- 44 years old
- Condition
- Good
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 145 ft
- 3 main spans
- Daily traffic
- 4,977
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Int West Big Timber is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int West Big Timber in Sweet Grass County, Montana. It was built in 1981, so it is 44 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,977 vehicles a day, roughly 22% of them trucks, projected to reach 5,300 by 2043. The structure is 145 ft (44.2 m) long and 44 ft wide.
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Int West Big Timber built?
It was built in 1981, making it 44 years old in 2025.
What condition is I 90 over Int West Big Timber in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does I 90 over Int West Big Timber carry?
About 4,977 vehicles per day (2023 count), of which roughly 22% are trucks.
How long is I 90 over Int West Big Timber?
The structure is 145 ft (44.2 m) long with a longest span of 72 ft (21.9 m) and a deck 44 ft wide.
Who owns I 90 over Int West Big Timber?
It is owned by the State Highway Agency.