I 90 over Jefferson River
GoodGallatin County, Montana · 0.6M W Three Forks · Structure no. I00090277+04472
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 274 ft
- 3 main spans
- Daily traffic
- 8,575
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Jefferson River is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Jefferson River in Gallatin County, Montana. It was built in 1968, so it is 57 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 8,575 vehicles a day, roughly 14% of them trucks, projected to reach 9,689 by 2043. The structure is 274 ft (83.5 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
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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| 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 Jefferson River built?
It was built in 1968, making it 57 years old in 2025.
What condition is I 90 over Jefferson River 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 July 2024.
How much traffic does I 90 over Jefferson River carry?
About 8,575 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is I 90 over Jefferson River?
The structure is 274 ft (83.5 m) long with a longest span of 92 ft (27.9 m) and a deck 41 ft wide.
Who owns I 90 over Jefferson River?
It is owned by the State Highway Agency.