IRR - US 87 over School Section Coulee
GoodChouteau County, Montana · 4M N Big Sandy · Structure no. 000000000008092
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected April 2024
- Type
- Culvert
- Steel
- Length
- 24 ft
- 2 main spans
- Daily traffic
- 1,694
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - US 87 over School Section Coulee is a steel culvert carrying IRR - US 87 over School Section Coulee in Chouteau County, Montana. It was built in 1970, so it is 55 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 1,694 vehicles a day, roughly 8% of them trucks, projected to reach 1,779 by 2043. The structure is 24 ft (7.2 m) long and 164 ft wide. If it were closed, the detour would be 123.7 mi (199 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - US 87 over School Section Coulee built?
It was built in 1970, making it 55 years old in 2025.
What condition is IRR - US 87 over School Section Coulee 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 April 2024.
How much traffic does IRR - US 87 over School Section Coulee carry?
About 1,694 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is IRR - US 87 over School Section Coulee?
The structure is 24 ft (7.2 m) long with a longest span of 10 ft (3 m) and a deck 164 ft wide.
Who owns IRR - US 87 over School Section Coulee?
It is owned by the State Highway Agency.