I 90 over Sep Garrison Frontage RD
FairPowell County, Montana · 2.5M W Garrison · Structure no. I00090171+07791
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected August 2024
- Type
- Slab
- Concrete Continuous
- Length
- 78 ft
- 3 main spans
- Daily traffic
- 5,136
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Sep Garrison Frontage RD is a concrete continuous slab carrying I 90 over Sep Garrison Frontage RD in Powell County, Montana. It was built in 1973, so it is 52 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 5,136 vehicles a day, roughly 22% of them trucks, projected to reach 5,469 by 2043. The structure is 78 ft (23.8 m) long and 44 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 | 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 Garrison Frontage RD built?
It was built in 1973, making it 52 years old in 2025.
What condition is I 90 over Sep Garrison Frontage RD 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 August 2024.
How much traffic does I 90 over Sep Garrison Frontage RD carry?
About 5,136 vehicles per day (2023 count), of which roughly 22% are trucks.
How long is I 90 over Sep Garrison Frontage RD?
The structure is 78 ft (23.8 m) long with a longest span of 30 ft (9.1 m) and a deck 44 ft wide.
Who owns I 90 over Sep Garrison Frontage RD?
It is owned by the State Highway Agency.