I 15 over Int Manchester
FairCascade County, Montana · 4M S Vaughn · Structure no. I00015286+05751
- Built
- 1960
- 65 years old
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 110 ft
- 3 main spans
- Daily traffic
- 4,555
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Int Manchester is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Int Manchester in Cascade County, Montana. It was built in 1960, so it is 65 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 4,555 vehicles a day, roughly 11% of them trucks, projected to reach 4,782 by 2043. The structure is 110 ft (33.5 m) long and 41 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Int Manchester built?
It was built in 1960, making it 65 years old in 2025.
What condition is I 15 over Int Manchester in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.
How much traffic does I 15 over Int Manchester carry?
About 4,555 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is I 15 over Int Manchester?
The structure is 110 ft (33.5 m) long with a longest span of 36 ft (11.1 m) and a deck 41 ft wide.
Who owns I 15 over Int Manchester?
It is owned by the State Highway Agency.