IRR - I 90 over Int Garryowen
FairBig Horn County, Montana · 5.6M S Crow Agency · Structure no. I00090514+07722
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 101 ft
- 1 main span
- Daily traffic
- 2,082
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - I 90 over Int Garryowen is a prestressed concrete stringer/multi-beam or girder carrying IRR - I 90 over Int Garryowen in Big Horn 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 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 2,082 vehicles a day, roughly 23% of them trucks, projected to reach 2,227 by 2043. The structure is 101 ft (30.8 m) long and 44 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - I 90 over Int Garryowen built?
It was built in 1976, making it 49 years old in 2025.
What condition is IRR - I 90 over Int Garryowen 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 October 2024.
How much traffic does IRR - I 90 over Int Garryowen carry?
About 2,082 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is IRR - I 90 over Int Garryowen?
The structure is 101 ft (30.8 m) long with a longest span of 100 ft (30.5 m) and a deck 44 ft wide.
Who owns IRR - I 90 over Int Garryowen?
It is owned by the State Highway Agency.