I 15 over Sep 5th Ave SW
GoodCascade County, Montana · Great Falls · Structure no. I00015280+00942
- Built
- 1967
- 58 years old
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 125 ft
- 3 main spans
- Daily traffic
- 5,254
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Sep 5th Ave SW is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Sep 5th Ave SW in Cascade County, Montana. It was built in 1967, so it is 58 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 5,254 vehicles a day, roughly 9% of them trucks, projected to reach 5,516 by 2043. The structure is 125 ft (38.1 m) long and 39 ft wide. 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 |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| 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 Sep 5th Ave SW built?
It was built in 1967, making it 58 years old in 2025.
What condition is I 15 over Sep 5th Ave SW 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 October 2024.
How much traffic does I 15 over Sep 5th Ave SW carry?
About 5,254 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is I 15 over Sep 5th Ave SW?
The structure is 125 ft (38.1 m) long with a longest span of 52 ft (15.7 m) and a deck 39 ft wide.
Who owns I 15 over Sep 5th Ave SW?
It is owned by the State Highway Agency.