IRR - S 313 over Indian Service Canal
FairBig Horn County, Montana · 10M SW ST Xavier · Structure no. S00313035+00261
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected January 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 67 ft
- 1 main span
- Daily traffic
- 503
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - S 313 over Indian Service Canal is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 313 over Indian Service Canal in Big Horn County, Montana. It was built in 1962, so it is 63 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 503 vehicles a day, roughly 9% of them trucks, projected to reach 528 by 2043. The structure is 67 ft (20.4 m) long and 34 ft wide. If it were closed, the detour would be 80.2 mi (129 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 - S 313 over Indian Service Canal built?
It was built in 1962, making it 63 years old in 2025.
What condition is IRR - S 313 over Indian Service Canal 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 January 2024.
How much traffic does IRR - S 313 over Indian Service Canal carry?
About 503 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is IRR - S 313 over Indian Service Canal?
The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 34 ft wide.
Who owns IRR - S 313 over Indian Service Canal?
It is owned by the State Highway Agency.