Structure 64100112 · Union County, SD
Carries 30820 480 Ave. over Ck, 1e & 6.2s Alcester.
25 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | South Dakota |
| County | Union |
| Location | 1e & 6.2s Alcester |
| Carries | 30820 480 Ave. |
| Crosses | Ck |
| Coordinates | 42.91950, -96.60706 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 23.0 ft (7 m) |
| Deck Width | 22.3 ft (6.8 m) |
| Deck Area | 51.7 sq m |
| Main Spans | 1 |
| Year Built | 1935 (reconstructed 1975) |
| Avg Daily Traffic | 40 (2022) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2024 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Unknown |
| Structure Number | 000000064100112 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.