I 15 over Int Red Rock-Red Rock RD
FairBeaverhead County, Montana · 7.4M S Clark Canyon Dam · Structure no. I00015037+03521
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 123 ft
- 3 main spans
- Daily traffic
- 2,116
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Int Red Rock-Red Rock RD is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Int Red Rock-Red Rock RD in Beaverhead County, Montana. It was built in 1971, so it is 54 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 2,116 vehicles a day, roughly 25% of them trucks, projected to reach 2,264 by 2043. The structure is 123 ft (37.5 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| 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 Red Rock-Red Rock RD built?
It was built in 1971, making it 54 years old in 2025.
What condition is I 15 over Int Red Rock-Red Rock 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 October 2024.
How much traffic does I 15 over Int Red Rock-Red Rock RD carry?
About 2,116 vehicles per day (2023 count), of which roughly 25% are trucks.
How long is I 15 over Int Red Rock-Red Rock RD?
The structure is 123 ft (37.5 m) long with a longest span of 60 ft (18.3 m) and a deck 44 ft wide.
Who owns I 15 over Int Red Rock-Red Rock RD?
It is owned by the State Highway Agency.