I 90 over Drainage
GoodGranite County, Montana · 4.8M E Bearmouth Int · Structure no. I00090142+09001
- Built
- 1971
- 54 years old
- Condition
- Good
- inspected May 2024
- Type
- Culvert
- Steel
- Length
- 25 ft
- 2 main spans
- Daily traffic
- 13,081
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Drainage is a steel culvert carrying I 90 over Drainage in Granite County, Montana. It was built in 1971, so it is 54 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 13,081 vehicles a day, roughly 18% of them trucks, projected to reach 13,997 by 2043. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 1.2 mi (2 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 | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Drainage built?
It was built in 1971, making it 54 years old in 2025.
What condition is I 90 over Drainage 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 May 2024.
How much traffic does I 90 over Drainage carry?
About 13,081 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is I 90 over Drainage?
The structure is 25 ft (7.7 m) long with a longest span of 11 ft (3.3 m).
Who owns I 90 over Drainage?
It is owned by the State Highway Agency.