S 1 over Int I 90
FairDeer Lodge County, Montana · 6M S Warm Springs · Structure no. P00019000+00001
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 276 ft
- 5 main spans
- Daily traffic
- 4,640
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 1 over Int I 90 is a prestressed concrete stringer/multi-beam or girder carrying S 1 over Int I 90 in Deer Lodge 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 4,640 vehicles a day, roughly 2% of them trucks, projected to reach 4,872 by 2043. The structure is 276 ft (84.1 m) long and 41 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 1 over Int I 90 built?
It was built in 1964, making it 61 years old in 2025.
What condition is S 1 over Int I 90 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 June 2024.
How much traffic does S 1 over Int I 90 carry?
About 4,640 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is S 1 over Int I 90?
The structure is 276 ft (84.1 m) long with a longest span of 56 ft (17.2 m) and a deck 41 ft wide.
Who owns S 1 over Int I 90?
It is owned by the State Highway Agency.