US085 over Spearfish Ck
FairLawrence County, South Dakota · 0.2 W Cheyenne Xing · Structure no. 000000041091213
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected November 2024
- Type
- Slab
- Concrete Continuous
- Length
- 67 ft
- 3 main spans
- Daily traffic
- 1,102
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US085 over Spearfish Ck is a concrete continuous slab carrying US085 over Spearfish Ck in Lawrence County, South Dakota. It was built in 1964, so it is 61 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 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 1,102 vehicles a day, roughly 9% of them trucks, projected to reach 1,597 by 2044. The structure is 67 ft (20.5 m) long and 34 ft wide. If it were closed, the detour would be 52.2 mi (84 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US085 over Spearfish Ck built?
It was built in 1964, making it 61 years old in 2025.
What condition is US085 over Spearfish 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 November 2024.
How much traffic does US085 over Spearfish Ck carry?
About 1,102 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is US085 over Spearfish Ck?
The structure is 67 ft (20.5 m) long with a longest span of 23 ft (7.1 m) and a deck 34 ft wide.
Who owns US085 over Spearfish Ck?
It is owned by the State Highway Agency.