I 90 over Sep Bearmouth Road
GoodGranite County, Montana · 10.5M W Drummond · Structure no. I00090143+06511
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 119 ft
- 3 main spans
- Daily traffic
- 13,081
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Sep Bearmouth Road is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Sep Bearmouth Road in Granite County, Montana. It was built in 1970, so it is 55 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 13,081 vehicles a day, roughly 18% of them trucks, projected to reach 13,997 by 2043. The structure is 119 ft (36.3 m) long and 78 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Sep Bearmouth Road built?
It was built in 1970, making it 55 years old in 2025.
What condition is I 90 over Sep Bearmouth Road in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.
How much traffic does I 90 over Sep Bearmouth Road carry?
About 13,081 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is I 90 over Sep Bearmouth Road?
The structure is 119 ft (36.3 m) long with a longest span of 46 ft (14 m) and a deck 78 ft wide.
Who owns I 90 over Sep Bearmouth Road?
It is owned by the State Highway Agency.