IRR - I 90 over Little Bighorn River
GoodBig Horn County, Montana · 8M S Crow Agency · Structure no. I00090517+05022
- Built
- 1980
- 45 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 165 ft
- 2 main spans
- Daily traffic
- 2,082
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - I 90 over Little Bighorn River is a prestressed concrete stringer/multi-beam or girder carrying IRR - I 90 over Little Bighorn River in Big Horn County, Montana. It was built in 1980, so it is 45 years old, younger 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 2,082 vehicles a day, roughly 23% of them trucks, projected to reach 2,227 by 2043. The structure is 165 ft (50.2 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
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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - I 90 over Little Bighorn River built?
It was built in 1980, making it 45 years old in 2025.
What condition is IRR - I 90 over Little Bighorn 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 May 2024.
How much traffic does IRR - I 90 over Little Bighorn River carry?
About 2,082 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is IRR - I 90 over Little Bighorn River?
The structure is 165 ft (50.2 m) long with a longest span of 81 ft (24.7 m) and a deck 44 ft wide.
Who owns IRR - I 90 over Little Bighorn River?
It is owned by the State Highway Agency.