I 90 over Yellowstone River
FairStillwater County, Montana · 5.6M E Reedpoint · Structure no. I00090398+00811
- Built
- 1961
- 64 years old, rebuilt 2014
- Condition
- Fair
- inspected August 2023
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 558 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 girder and floorbeam system carrying I 90 over Yellowstone River in Stillwater County, Montana. It was built in 1961 and reconstructed in 2014, so it is 64 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 5 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 558 ft (170 m) long and 32 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 1961, making it 64 years old in 2025. It was reconstructed in 2014.
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 558 ft (170 m) long with a longest span of 155 ft (47.2 m) and a deck 32 ft wide.
Who owns I 90 over Yellowstone River?
It is owned by the State Highway Agency.