47870 308 Str. over West Union Ck
FairUnion County, South Dakota · 7S & 0.3W Alcester · Structure no. 000000064087110
- Built
- 1957
- 68 years old, rebuilt 1981
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 40 ft
- 1 main span
- Daily traffic
- 35
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
47870 308 Str. over West Union Ck is a steel stringer/multi-beam or girder carrying 47870 308 Str. over West Union Ck in Union County, South Dakota. It was built in 1957 and reconstructed in 1981, so it is 68 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 35 vehicles a day, roughly 2% of them trucks, projected to reach 35 by 2032. The structure is 40 ft (12.3 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 47870 308 Str. over West Union Ck built?
It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1981.
What condition is 47870 308 Str. over West Union 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 August 2024.
How much traffic does 47870 308 Str. over West Union Ck carry?
About 35 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 47870 308 Str. over West Union Ck?
The structure is 40 ft (12.3 m) long with a longest span of 39 ft (11.8 m) and a deck 29 ft wide.
Who owns 47870 308 Str. over West Union Ck?
It is owned by the County Highway Agency.