I 15 over Int Main ST
FairTeton County, Montana · Dutton · Structure no. I00015313+02481
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 76 ft
- 1 main span
- Daily traffic
- 1,703
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Int Main ST is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Int Main ST in Teton County, Montana. It was built in 1976, so it is 49 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 1,703 vehicles a day, roughly 25% of them trucks, projected to reach 1,787 by 2043. The structure is 76 ft (23.2 m) long and 44 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 | 8 Very Good | No problems noted. |
| 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 Main ST built?
It was built in 1976, making it 49 years old in 2025.
What condition is I 15 over Int Main ST 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 15 over Int Main ST carry?
About 1,703 vehicles per day (2023 count), of which roughly 25% are trucks.
How long is I 15 over Int Main ST?
The structure is 76 ft (23.2 m) long with a longest span of 75 ft (22.9 m) and a deck 44 ft wide.
Who owns I 15 over Int Main ST?
It is owned by the State Highway Agency.