I 15 over Sep High Bridge RD
FairBeaverhead County, Montana · 6.2M N Clark Canyon Dam · Structure no. I00015051+00471
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 79 ft
- 3 main spans
- Daily traffic
- 2,185
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Sep High Bridge RD is a concrete continuous slab carrying I 15 over Sep High Bridge RD in Beaverhead County, Montana. It was built in 1988, so it is 37 years old, younger 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 2,185 vehicles a day, roughly 25% of them trucks, projected to reach 2,338 by 2043. The structure is 79 ft (24.1 m) long and 40 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 Sep High Bridge RD built?
It was built in 1988, making it 37 years old in 2025.
What condition is I 15 over Sep High Bridge RD 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 2024.
How much traffic does I 15 over Sep High Bridge RD carry?
About 2,185 vehicles per day (2023 count), of which roughly 25% are trucks.
How long is I 15 over Sep High Bridge RD?
The structure is 79 ft (24.1 m) long with a longest span of 30 ft (9.1 m) and a deck 40 ft wide.
Who owns I 15 over Sep High Bridge RD?
It is owned by the State Highway Agency.