IRR - S 313 over Two Leggin Canal
GoodBig Horn County, Montana · 7M SW Hardin · Structure no. S00313007+08411
- Built
- 1991
- 34 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 72 ft
- 1 main span
- Daily traffic
- 899
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - S 313 over Two Leggin Canal is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 313 over Two Leggin Canal in Big Horn County, Montana. It was built in 1991, so it is 34 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 899 vehicles a day, roughly 17% of them trucks, projected to reach 944 by 2043. The structure is 72 ft (21.9 m) long and 37 ft wide. If it were closed, the detour would be 80.2 mi (129 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 - S 313 over Two Leggin Canal built?
It was built in 1991, making it 34 years old in 2025.
What condition is IRR - S 313 over Two Leggin Canal 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 November 2023.
How much traffic does IRR - S 313 over Two Leggin Canal carry?
About 899 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is IRR - S 313 over Two Leggin Canal?
The structure is 72 ft (21.9 m) long with a longest span of 72 ft (21.9 m) and a deck 37 ft wide.
Who owns IRR - S 313 over Two Leggin Canal?
It is owned by the State Highway Agency.