US 89 over Int Mission I 90
FairPark County, Montana · 5M NE Livingston · Structure no. P00059000+00001
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 211 ft
- 4 main spans
- Daily traffic
- 2,174
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 89 over Int Mission I 90 is a prestressed concrete stringer/multi-beam or girder carrying US 89 over Int Mission I 90 in Park County, Montana. It was built in 1962, so it is 63 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 2,174 vehicles a day, roughly 2% of them trucks, projected to reach 2,283 by 2043. The structure is 211 ft (64.3 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 89 over Int Mission I 90 built?
It was built in 1962, making it 63 years old in 2025.
What condition is US 89 over Int Mission I 90 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 February 2025.
How much traffic does US 89 over Int Mission I 90 carry?
About 2,174 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is US 89 over Int Mission I 90?
The structure is 211 ft (64.3 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.
Who owns US 89 over Int Mission I 90?
It is owned by the State Highway Agency.