IRR - Frontage 315 over Little Bighorn River 002
FairBig Horn County, Montana · 2M S Crow Agency · Structure no. L02315003+02001
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 163 ft
- 2 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - Frontage 315 over Little Bighorn River 002 is a prestressed concrete stringer/multi-beam or girder carrying IRR - Frontage 315 over Little Bighorn River 002 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 163 ft (49.7 m) long and 30 ft wide. If it were closed, the detour would be 8.7 mi (14 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 | 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - Frontage 315 over Little Bighorn River 002 built?
It was built in 1976, making it 49 years old in 2025.
What condition is IRR - Frontage 315 over Little Bighorn River 002 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 June 2023.
How much traffic does IRR - Frontage 315 over Little Bighorn River 002 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is IRR - Frontage 315 over Little Bighorn River 002?
The structure is 163 ft (49.7 m) long with a longest span of 81 ft (24.6 m) and a deck 30 ft wide.
Who owns IRR - Frontage 315 over Little Bighorn River 002?
It is owned by the State Highway Agency.