I 15 over Birch Creek
FairBeaverhead County, Montana · 13M N Dillon · Structure no. I00015077+02001
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected April 2024
- Type
- Culvert
- Steel
- Length
- 26 ft
- 2 main spans
- Daily traffic
- 3,852
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Birch Creek is a steel culvert carrying I 15 over Birch Creek in Beaverhead County, Montana. It was built in 1973, so it is 52 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 3,852 vehicles a day, roughly 24% of them trucks, projected to reach 4,160 by 2043. The structure is 26 ft (7.8 m) long.
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 |
|---|---|---|
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Birch Creek built?
It was built in 1973, making it 52 years old in 2025.
What condition is I 15 over Birch Creek 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 April 2024.
How much traffic does I 15 over Birch Creek carry?
About 3,852 vehicles per day (2023 count), of which roughly 24% are trucks.
How long is I 15 over Birch Creek?
The structure is 26 ft (7.8 m) long with a longest span of 10 ft (3.1 m).
Who owns I 15 over Birch Creek?
It is owned by the State Highway Agency.