47930 311th ST over West Union Ck
FairUnion County, South Dakota · 9.5S & 0.3E Alcester · Structure no. 000000064093140
- Built
- 1981
- 44 years old
- Condition
- Fair
- inspected August 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 41 ft
- 1 main span
- Daily traffic
- 100
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
47930 311th ST over West Union Ck is a prestressed concrete tee beam carrying 47930 311th ST over West Union Ck in Union County, South Dakota. It was built in 1981, so it is 44 years old, younger 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 100 vehicles a day, roughly 2% of them trucks, projected to reach 100 by 2032. The structure is 41 ft (12.4 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 47930 311th ST over West Union Ck built?
It was built in 1981, making it 44 years old in 2025.
What condition is 47930 311th ST 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 47930 311th ST over West Union Ck carry?
About 100 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 47930 311th ST over West Union Ck?
The structure is 41 ft (12.4 m) long with a longest span of 39 ft (11.8 m) and a deck 28 ft wide.
Who owns 47930 311th ST over West Union Ck?
It is owned by the County Highway Agency.