I 90 over Sep Coal Mine Road
GoodMissoula County, Montana · Missoula · Structure no. I00090103+01641
- Built
- 1966
- 59 years old
- Condition
- Good
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 138 ft
- 3 main spans
- Daily traffic
- 13,664
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Sep Coal Mine Road is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Sep Coal Mine Road in Missoula County, Montana. It was built in 1966, so it is 59 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 13,664 vehicles a day, roughly 9% of them trucks, projected to reach 14,552 by 2042. The structure is 138 ft (42.1 m) long and 40 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Sep Coal Mine Road built?
It was built in 1966, making it 59 years old in 2025.
What condition is I 90 over Sep Coal Mine 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 January 2025.
How much traffic does I 90 over Sep Coal Mine Road carry?
About 13,664 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is I 90 over Sep Coal Mine Road?
The structure is 138 ft (42.1 m) long with a longest span of 52 ft (15.7 m) and a deck 40 ft wide.
Who owns I 90 over Sep Coal Mine Road?
It is owned by the State Highway Agency.