I 15 over Dog Creek
FairLewis and Clark County, Montana · 1M S Craig · Structure no. I00015233+06001
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected April 2024
- Type
- Culvert
- Steel
- Length
- 23 ft
- 2 main spans
- Daily traffic
- 4,290
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Dog Creek is a steel culvert carrying I 15 over Dog Creek in Lewis and Clark County, Montana. It was built in 1967, so it is 58 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 4,290 vehicles a day, roughly 17% of them trucks, projected to reach 4,569 by 2043. The structure is 23 ft (7 m) long and 82 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 |
|---|---|---|
| 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 Dog Creek built?
It was built in 1967, making it 58 years old in 2025.
What condition is I 15 over Dog 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 Dog Creek carry?
About 4,290 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is I 15 over Dog Creek?
The structure is 23 ft (7 m) long with a longest span of 10 ft (2.9 m) and a deck 82 ft wide.
Who owns I 15 over Dog Creek?
It is owned by the State Highway Agency.