47960 312th ST over West Union Ck
PoorPosted for loadUnion County, South Dakota · 11.5S & 0.6E Alcester · Structure no. 000000064096150
- Built
- 1986
- 39 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 79 ft
- 1 main span
- Daily traffic
- 40
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
47960 312th ST over West Union Ck is a steel stringer/multi-beam or girder carrying 47960 312th ST over West Union Ck in Union County, South Dakota. It was built in 1986, so it is 39 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 40 vehicles a day, roughly 2% of them trucks, projected to reach 40 by 2032. The structure is 79 ft (24.2 m) long and 28 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 47960 312th ST over West Union Ck built?
It was built in 1986, making it 39 years old in 2025.
What condition is 47960 312th ST over West Union Ck in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.
How much traffic does 47960 312th ST over West Union Ck carry?
About 40 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 47960 312th ST over West Union Ck?
The structure is 79 ft (24.2 m) long with a longest span of 78 ft (23.8 m) and a deck 28 ft wide.
Who owns 47960 312th ST over West Union Ck?
It is owned by the County Highway Agency.