IRR BIA RTE 6 over Little Bighorn River
GoodBig Horn County, Montana · At Crow Agency · Structure no. 00000000000C226
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected June 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 122 ft
- 1 main span
- Daily traffic
- 1,000
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 6 over Little Bighorn River is a prestressed concrete tee beam carrying IRR BIA RTE 6 over Little Bighorn River in Big Horn County, Montana. It was built in 1999, so it is 26 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,170 by 2042. The structure is 122 ft (37.2 m) long and 39 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 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 BIA RTE 6 over Little Bighorn River built?
It was built in 1999, making it 26 years old in 2025.
What condition is IRR BIA RTE 6 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 June 2024.
How much traffic does IRR BIA RTE 6 over Little Bighorn River carry?
About 1,000 vehicles per day (2024 count), of which roughly 10% are trucks.
How long is IRR BIA RTE 6 over Little Bighorn River?
The structure is 122 ft (37.2 m) long with a longest span of 118 ft (36 m) and a deck 39 ft wide.
Who owns IRR BIA RTE 6 over Little Bighorn River?
It is owned by the Bureau of Indian Affairs.