31870 477th AVE over County Ditch
Good Condition78 years old300 vehicles/day
Location
| State | South Dakota |
| County | Union |
| Location | 0.5n Jct Sd 50 |
| Carries | 31870 477th AVE |
| Crosses | County Ditch |
| Coordinates | 42.77361, -96.66503 |
Condition Ratings
| Overall Condition | Good |
| Channel/Waterway | 6 (Satisfactory) |
| Culvert | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 44.0 ft (13.4 m) |
| Max Span | 14.1 ft (4.3 m) |
| Deck Area | 89.8 sq m |
| Main Spans | 3 |
| Year Built | 1948 |
Traffic
| Avg Daily Traffic | 300 (2022) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 824 |
| Inspection Frequency | Every 48 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000064070217 |