Irrcounty Road 380 over Smoke Creek 017
FairRoosevelt County, Montana · 20M N Brockton · Structure no. L43380010+07001
- Built
- 1957
- 68 years old
- Condition
- Fair
- inspected November 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 110 ft
- 3 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Irrcounty Road 380 over Smoke Creek 017 is a concrete continuous tee beam carrying Irrcounty Road 380 over Smoke Creek 017 in Roosevelt County, Montana. It was built in 1957, so it is 68 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 110 ft (33.5 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 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 |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Irrcounty Road 380 over Smoke Creek 017 built?
It was built in 1957, making it 68 years old in 2025.
What condition is Irrcounty Road 380 over Smoke Creek 017 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 November 2023.
How much traffic does Irrcounty Road 380 over Smoke Creek 017 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Irrcounty Road 380 over Smoke Creek 017?
The structure is 110 ft (33.5 m) long with a longest span of 70 ft (21.3 m) and a deck 27 ft wide.
Who owns Irrcounty Road 380 over Smoke Creek 017?
It is owned by the County Highway Agency.