I090 W over Spearfish Ck
FairLawrence County, South Dakota · 0.3 W US 85 Interch · Structure no. 000000041091058
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 154 ft
- 3 main spans
- Daily traffic
- 5,322
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I090 W over Spearfish Ck is a steel continuous stringer/multi-beam or girder carrying I090 W over Spearfish Ck in Lawrence County, South Dakota. It was built in 1971, so it is 54 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 5,322 vehicles a day, roughly 12% of them trucks, projected to reach 8,356 by 2044. The structure is 154 ft (46.9 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 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 I090 W over Spearfish Ck built?
It was built in 1971, making it 54 years old in 2025.
What condition is I090 W 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 January 2025.
How much traffic does I090 W over Spearfish Ck carry?
About 5,322 vehicles per day (2024 count), of which roughly 12% are trucks.
How long is I090 W over Spearfish Ck?
The structure is 154 ft (46.9 m) long with a longest span of 63 ft (19.2 m) and a deck 41 ft wide.
Who owns I090 W over Spearfish Ck?
It is owned by the State Highway Agency.