US085 over Four Mile Ck
FairButte County, South Dakota · 8.4 S Harding CO Line · Structure no. 000000010250086
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 158 ft
- 3 main spans
- Daily traffic
- 1,190
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US085 over Four Mile Ck is a steel continuous stringer/multi-beam or girder carrying US085 over Four Mile Ck in Butte County, South Dakota. It was built in 1965, so it is 60 years old, older than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 1,190 vehicles a day, roughly 31% of them trucks, projected to reach 1,708 by 2044. The structure is 158 ft (48.2 m) long and 32 ft wide. If it were closed, the detour would be 42.9 mi (69 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 US085 over Four Mile Ck built?
It was built in 1965, making it 60 years old in 2025.
What condition is US085 over Four Mile Ck 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 US085 over Four Mile Ck carry?
About 1,190 vehicles per day (2024 count), of which roughly 31% are trucks.
How long is US085 over Four Mile Ck?
The structure is 158 ft (48.2 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.
Who owns US085 over Four Mile Ck?
It is owned by the State Highway Agency.