I 90 over Yellowstone River
FairStillwater County, Montana · 5.6M E Reed Point · Structure no. I00090398+00812
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 578 ft
- 4 main spans
- Daily traffic
- 5,423
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Yellowstone River is a steel continuous stringer/multi-beam or girder carrying I 90 over Yellowstone River in Stillwater County, Montana. It was built in 1976, so it is 49 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 5,423 vehicles a day, roughly 20% of them trucks, projected to reach 5,829 by 2043. The structure is 578 ft (176.1 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 | 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 Yellowstone River built?
It was built in 1976, making it 49 years old in 2025.
What condition is I 90 over Yellowstone 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 August 2023.
How much traffic does I 90 over Yellowstone River carry?
About 5,423 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is I 90 over Yellowstone River?
The structure is 578 ft (176.1 m) long with a longest span of 165 ft (50.3 m) and a deck 44 ft wide.
Who owns I 90 over Yellowstone River?
It is owned by the State Highway Agency.