I 90 over Gallatin River
FairGallatin County, Montana · 3.1M E Manhattan · Structure no. I00090292+04252
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 206 ft
- 4 main spans
- Daily traffic
- 9,726
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Gallatin River is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Gallatin River in Gallatin County, Montana. It was built in 1965, so it is 60 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 9,726 vehicles a day, roughly 12% of them trucks, projected to reach 10,990 by 2043. The structure is 206 ft (62.8 m) long and 39 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Gallatin River built?
It was built in 1965, making it 60 years old in 2025.
What condition is I 90 over Gallatin River 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 Gallatin River carry?
About 9,726 vehicles per day (2023 count), of which roughly 12% are trucks.
How long is I 90 over Gallatin River?
The structure is 206 ft (62.8 m) long with a longest span of 52 ft (15.7 m) and a deck 39 ft wide.
Who owns I 90 over Gallatin River?
It is owned by the State Highway Agency.