I 90 over St. Regis River
FairMineral County, Montana · St. Regis · Structure no. I00090033+05282
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 246 ft
- 3 main spans
- Daily traffic
- 3,559
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over St. Regis River is a prestressed concrete stringer/multi-beam or girder carrying I 90 over St. Regis River in Mineral County, Montana. It was built in 1983, so it is 42 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 246 ft (75 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 St. Regis River built?
It was built in 1983, making it 42 years old in 2025.
What condition is I 90 over St. Regis River 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 January 2025.
How much traffic does I 90 over St. Regis River carry?
About 3,559 vehicles per day (2023 count), of which roughly 28% are trucks.
How long is I 90 over St. Regis River?
The structure is 246 ft (75 m) long with a longest span of 82 ft (25 m) and a deck 44 ft wide.
Who owns I 90 over St. Regis River?
It is owned by the State Highway Agency.