I 90 over Int Sloway
FairMineral County, Montana · 3.7M E St. Regis · Structure no. I00090037+02012
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 128 ft
- 3 main spans
- Daily traffic
- 3,559
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Int Sloway is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int Sloway in Mineral County, Montana. It was built in 1978, so it is 47 years old, younger 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 3,559 vehicles a day, roughly 28% of them trucks, projected to reach 3,736 by 2043. The structure is 128 ft (39 m) long and 44 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 | 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 Sloway built?
It was built in 1978, making it 47 years old in 2025.
What condition is I 90 over Int Sloway 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 April 2023.
How much traffic does I 90 over Int Sloway carry?
About 3,559 vehicles per day (2023 count), of which roughly 28% are trucks.
How long is I 90 over Int Sloway?
The structure is 128 ft (39 m) long with a longest span of 61 ft (18.6 m) and a deck 44 ft wide.
Who owns I 90 over Int Sloway?
It is owned by the State Highway Agency.