I 15 over Int N Cascade
GoodCascade County, Montana · Cascade · Structure no. I00015256+04831
- Built
- 1961
- 64 years old
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 124 ft
- 3 main spans
- Daily traffic
- 2,455
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Int N Cascade is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Int N Cascade in Cascade County, Montana. It was built in 1961, so it is 64 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 2,455 vehicles a day, roughly 16% of them trucks, projected to reach 2,578 by 2043. The structure is 124 ft (37.8 m) long and 47 ft wide.
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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Int N Cascade built?
It was built in 1961, making it 64 years old in 2025.
What condition is I 15 over Int N Cascade 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 July 2024.
How much traffic does I 15 over Int N Cascade carry?
About 2,455 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is I 15 over Int N Cascade?
The structure is 124 ft (37.8 m) long with a longest span of 47 ft (14.2 m) and a deck 47 ft wide.
Who owns I 15 over Int N Cascade?
It is owned by the State Highway Agency.