I 90 over St. Regis River
FairMineral County, Montana · 0.6M W Saltese · Structure no. I00090010+01221
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 154 ft
- 3 main spans
- Daily traffic
- 7,824
- 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 1973, so it is 52 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 7,824 vehicles a day, roughly 25% of them trucks, projected to reach 8,215 by 2043. The structure is 154 ft (46.9 m) long and 82 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 1973, making it 52 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 June 2023.
How much traffic does I 90 over St. Regis River carry?
About 7,824 vehicles per day (2023 count), of which roughly 25% are trucks.
How long is I 90 over St. Regis River?
The structure is 154 ft (46.9 m) long with a longest span of 72 ft (21.9 m) and a deck 82 ft wide.
Who owns I 90 over St. Regis River?
It is owned by the State Highway Agency.