IRR - Frontage 325 over Little Bighorn River 075
FairBig Horn County, Montana · 2M S Crow Agency · Structure no. L02325000+09001
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected August 2024
- 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 325 over Little Bighorn River 075 is a prestressed concrete stringer/multi-beam or girder carrying IRR - Frontage 325 over Little Bighorn River 075 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 6 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 34 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - Frontage 325 over Little Bighorn River 075 built?
It was built in 1976, making it 49 years old in 2025.
What condition is IRR - Frontage 325 over Little Bighorn River 075 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 August 2024.
How much traffic does IRR - Frontage 325 over Little Bighorn River 075 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is IRR - Frontage 325 over Little Bighorn River 075?
The structure is 163 ft (49.7 m) long with a longest span of 81 ft (24.6 m) and a deck 34 ft wide.
Who owns IRR - Frontage 325 over Little Bighorn River 075?
It is owned by the State Highway Agency.