31870 477th Ave over County Ditch
GoodUnion County, South Dakota · 0.5N JCT Sd 50 · Structure no. 000000064070217
- Built
- 1948
- 77 years old
- Condition
- Good
- inspected August 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 44 ft
- 3 main spans
- Daily traffic
- 300
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
31870 477th Ave over County Ditch is a concrete continuous culvert carrying 31870 477th Ave over County Ditch in Union County, South Dakota. It was built in 1948, so it is 77 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 300 vehicles a day, roughly 3% of them trucks, projected to reach 300 by 2032. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 11.8 mi (19 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 31870 477th Ave over County Ditch built?
It was built in 1948, making it 77 years old in 2025.
What condition is 31870 477th Ave over County Ditch in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does 31870 477th Ave over County Ditch carry?
About 300 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is 31870 477th Ave over County Ditch?
The structure is 44 ft (13.4 m) long with a longest span of 14 ft (4.3 m).
Who owns 31870 477th Ave over County Ditch?
It is owned by the County Highway Agency.