IRR BIA RTE 8 over Oswego South Main Canal
GoodValley County, Montana · 3.2 KM East of Oswego · Structure no. 00000000000C617
- Built
- 1983
- 42 years old
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 42 ft
- 1 main span
- Daily traffic
- 100
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 8 over Oswego South Main Canal is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE 8 over Oswego South Main Canal in Valley County, Montana. It was built in 1983, so it is 42 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 117 by 2044. The structure is 42 ft (12.9 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 8 over Oswego South Main Canal built?
It was built in 1983, making it 42 years old in 2025.
What condition is IRR BIA RTE 8 over Oswego South Main 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 October 2024.
How much traffic does IRR BIA RTE 8 over Oswego South Main Canal carry?
About 100 vehicles per day (2024 count), of which roughly 10% are trucks.
How long is IRR BIA RTE 8 over Oswego South Main Canal?
The structure is 42 ft (12.9 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.
Who owns IRR BIA RTE 8 over Oswego South Main Canal?
It is owned by the Bureau of Indian Affairs.