I 15 over Teton River
FairTeton County, Montana · 6M N Dutton · Structure no. I00015318+05741
- Built
- 1977
- 48 years old
- Condition
- Fair
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 433 ft
- 5 main spans
- Daily traffic
- 1,703
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Teton River is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Teton River in Teton County, Montana. It was built in 1977, so it is 48 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 433 ft (131.9 m) long and 44 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Teton River built?
It was built in 1977, making it 48 years old in 2025.
What condition is I 15 over Teton River 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 December 2024.
How much traffic does I 15 over Teton River carry?
About 1,703 vehicles per day (2023 count), of which roughly 25% are trucks.
How long is I 15 over Teton River?
The structure is 433 ft (131.9 m) long with a longest span of 97 ft (29.6 m) and a deck 44 ft wide.
Who owns I 15 over Teton River?
It is owned by the State Highway Agency.