I 90 over Drainage
GoodMineral County, Montana · St. Regis · Structure no. I00090033+01001
- Built
- 1986
- 39 years old
- Condition
- Good
- inspected August 2024
- Type
- Culvert
- Steel
- Length
- 21 ft
- 2 main spans
- Daily traffic
- 8,111
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Drainage is a steel culvert carrying I 90 over Drainage in Mineral County, Montana. It was built in 1986, so it is 39 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 8,111 vehicles a day, roughly 24% of them trucks, projected to reach 8,517 by 2043. The structure is 21 ft (6.5 m) long. 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 I 90 over Drainage built?
It was built in 1986, making it 39 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 August 2024.
How much traffic does I 90 over Drainage carry?
About 8,111 vehicles per day (2023 count), of which roughly 24% are trucks.
How long is I 90 over Drainage?
The structure is 21 ft (6.5 m) long with a longest span of 9 ft (2.6 m).
Who owns I 90 over Drainage?
It is owned by the State Highway Agency.