S 431 over Int Power I 15
FairTeton County, Montana · Power · Structure no. S00431019+08551
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 347 ft
- 4 main spans
- Daily traffic
- 493
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 431 over Int Power I 15 is a prestressed concrete stringer/multi-beam or girder carrying S 431 over Int Power I 15 in Teton County, Montana. It was built in 1972, so it is 53 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 493 vehicles a day, roughly 3% of them trucks, projected to reach 518 by 2043. The structure is 347 ft (105.9 m) long and 34 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 431 over Int Power I 15 built?
It was built in 1972, making it 53 years old in 2025.
What condition is S 431 over Int Power I 15 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 June 2023.
How much traffic does S 431 over Int Power I 15 carry?
About 493 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is S 431 over Int Power I 15?
The structure is 347 ft (105.9 m) long with a longest span of 122 ft (37.2 m) and a deck 34 ft wide.
Who owns S 431 over Int Power I 15?
It is owned by the State Highway Agency.