I 90 EB over St. Regis River
FairMineral County, Montana · 5.6M E De Borgia · Structure no. I00090024+04051
- Built
- 1980
- 45 years old, rebuilt 2008
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 381 ft
- 4 main spans
- Daily traffic
- 3,724
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 EB over St. Regis River is a prestressed concrete stringer/multi-beam or girder carrying I 90 EB over St. Regis River in Mineral County, Montana. It was built in 1980 and reconstructed in 2008, so it is 45 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 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 3,724 vehicles a day, roughly 26% of them trucks, projected to reach 3,910 by 2043. The structure is 381 ft (116.1 m) long and 42 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 | 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 EB over St. Regis River built?
It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2008.
What condition is I 90 EB 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 November 2023.
How much traffic does I 90 EB over St. Regis River carry?
About 3,724 vehicles per day (2023 count), of which roughly 26% are trucks.
How long is I 90 EB over St. Regis River?
The structure is 381 ft (116.1 m) long with a longest span of 97 ft (29.6 m) and a deck 42 ft wide.
Who owns I 90 EB over St. Regis River?
It is owned by the State Highway Agency.