I 115S over Excelsior Ave
FairSilver Bow County, Montana · Butte · Structure no. I00115001+01871
- Built
- 1955
- 70 years old
- Condition
- Fair
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 156 ft
- 3 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- State
- State Highway Agency
About this bridge
I 115S over Excelsior Ave is a concrete continuous tee beam carrying I 115S over Excelsior Ave in Silver Bow County, Montana. It was built in 1955, so it is 70 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 156 ft (47.5 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 115S over Excelsior Ave built?
It was built in 1955, making it 70 years old in 2025.
What condition is I 115S over Excelsior Ave 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 May 2023.
How much traffic does I 115S over Excelsior Ave carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is I 115S over Excelsior Ave?
The structure is 156 ft (47.5 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.
Who owns I 115S over Excelsior Ave?
It is owned by the State Highway Agency.