Castle Butte RD over Cow Gulch 186
FairYellowstone County, Montana · 8M N Pompey`s Pillar · Structure no. L56903005+08001
- Built
- 1997
- 28 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 42 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Castle Butte RD over Cow Gulch 186 is a wood or timber stringer/multi-beam or girder carrying Castle Butte RD over Cow Gulch 186 in Yellowstone County, Montana. It was built in 1997, so it is 28 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 42 ft (12.8 m) long and 29 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 7 Good | Some minor problems. |
| 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 Castle Butte RD over Cow Gulch 186 built?
It was built in 1997, making it 28 years old in 2025.
What condition is Castle Butte RD over Cow Gulch 186 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 2023.
How much traffic does Castle Butte RD over Cow Gulch 186 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Castle Butte RD over Cow Gulch 186?
The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 29 ft wide.
Who owns Castle Butte RD over Cow Gulch 186?
It is owned by the County Highway Agency.