IRR BIA RTE 4 over Four Horns Canal
GoodGlacier County, Montana · 8.1 KM N of Heart Butte · Structure no. 00000000000C108
- Built
- 1972
- 53 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 48 ft
- 1 main span
- Daily traffic
- 500
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 4 over Four Horns Canal is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE 4 over Four Horns Canal in Glacier County, Montana. It was built in 1972, so it is 53 years old, older 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 585 by 2043. The structure is 48 ft (14.5 m) long and 34 ft wide. If it were closed, the detour would be 49.7 mi (80 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 4 over Four Horns Canal built?
It was built in 1972, making it 53 years old in 2025.
What condition is IRR BIA RTE 4 over Four Horns 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 September 2023.
How much traffic does IRR BIA RTE 4 over Four Horns Canal carry?
About 500 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is IRR BIA RTE 4 over Four Horns Canal?
The structure is 48 ft (14.5 m) long with a longest span of 45 ft (13.7 m) and a deck 34 ft wide.
Who owns IRR BIA RTE 4 over Four Horns Canal?
It is owned by the Bureau of Indian Affairs.