I 15 over Int S Montana Street
FairSilver Bow County, Montana · Butte · Structure no. I00015126+03161
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected February 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 168 ft
- 1 main span
- Daily traffic
- 9,878
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Int S Montana Street is a steel stringer/multi-beam or girder carrying I 15 over Int S Montana Street in Silver Bow 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 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 9,878 vehicles a day, roughly 11% of them trucks, projected to reach 10,569 by 2043. The structure is 168 ft (51.2 m) long and 32 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Int S Montana Street built?
It was built in 1961, making it 64 years old in 2025.
What condition is I 15 over Int S Montana Street 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 February 2023.
How much traffic does I 15 over Int S Montana Street carry?
About 9,878 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is I 15 over Int S Montana Street?
The structure is 168 ft (51.2 m) long with a longest span of 75 ft (22.9 m) and a deck 32 ft wide.
Who owns I 15 over Int S Montana Street?
It is owned by the State Highway Agency.