SD020 over Big Slough Ck
FairSpink County, South Dakota · 2.1 W JCT US 281 · Structure no. 000000058079060
- Built
- 1955
- 70 years old
- Condition
- Fair
- inspected April 2024
- Type
- Slab
- Concrete Continuous
- Length
- 54 ft
- 3 main spans
- Daily traffic
- 972
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD020 over Big Slough Ck is a concrete continuous slab carrying SD020 over Big Slough Ck in Spink County, South Dakota. It was built in 1955, so it is 70 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 972 vehicles a day, roughly 12% of them trucks, projected to reach 1,323 by 2044. The structure is 54 ft (16.5 m) long and 34 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 SD020 over Big Slough Ck built?
It was built in 1955, making it 70 years old in 2025.
What condition is SD020 over Big Slough 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 SD020 over Big Slough Ck carry?
About 972 vehicles per day (2024 count), of which roughly 12% are trucks.
How long is SD020 over Big Slough Ck?
The structure is 54 ft (16.5 m) long with a longest span of 18 ft (5.6 m) and a deck 34 ft wide.
Who owns SD020 over Big Slough Ck?
It is owned by the State Highway Agency.