I 90 over Sep Valley Center Spur
FairGallatin County, Montana · 2.5M W Bozeman · Structure no. I00090303+05881
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 114 ft
- 3 main spans
- Daily traffic
- 15,554
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Sep Valley Center Spur is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Sep Valley Center Spur in Gallatin 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 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 15,554 vehicles a day, roughly 10% of them trucks, projected to reach 17,342 by 2043. The structure is 114 ft (34.7 m) long and 41 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Sep Valley Center Spur built?
It was built in 1966, making it 59 years old in 2025.
What condition is I 90 over Sep Valley Center Spur 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 May 2024.
How much traffic does I 90 over Sep Valley Center Spur carry?
About 15,554 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I 90 over Sep Valley Center Spur?
The structure is 114 ft (34.7 m) long with a longest span of 40 ft (12.2 m) and a deck 41 ft wide.
Who owns I 90 over Sep Valley Center Spur?
It is owned by the State Highway Agency.