I 90 over Sep Fort Ellis Road
FairGallatin County, Montana · 1.2M E Bozeman · Structure no. I00090310+09781
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 79 ft
- 3 main spans
- Daily traffic
- 9,819
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Sep Fort Ellis Road is a concrete continuous slab carrying I 90 over Sep Fort Ellis Road in Gallatin County, Montana. It was built in 1971, so it is 54 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 6 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 9,819 vehicles a day, roughly 13% of them trucks, projected to reach 10,702 by 2043. The structure is 79 ft (24.1 m) long and 44 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Fort Ellis Road built?
It was built in 1971, making it 54 years old in 2025.
What condition is I 90 over Sep Fort Ellis Road 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 Fort Ellis Road carry?
About 9,819 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is I 90 over Sep Fort Ellis Road?
The structure is 79 ft (24.1 m) long with a longest span of 30 ft (9.1 m) and a deck 44 ft wide.
Who owns I 90 over Sep Fort Ellis Road?
It is owned by the State Highway Agency.