Structure 12085080 · Charles Mix County, SD
Carries Sd044 over Mo. Rv (lk Francis Case), Gregory - Charles Mix Co.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 5 of 9.
How ratings work5,656 ft end to end, longest span 250 ft: about 16 football fields, or 1.1 miles. 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 girder bridge.
| State | South Dakota |
| County | Charles Mix |
| Location | Gregory - Charles Mix Co |
| Carries | Sd044 |
| Crosses | Mo. Rv (lk Francis Case) |
| Coordinates | 43.38966, -99.12266 |
| Material | Steel Continuous |
| Design | Girder and Floorbeam |
| Total Length | 5655.5 ft (1723.8 m) |
| Max Span | 250.0 ft (76.2 m) |
| Deck Width | 30.2 ft (9.2 m) |
| Deck Area | 15859.0 sq m |
| Main Spans | 28 |
| Year Built | 1966 |
| Avg Daily Traffic | 980 (2024) |
| Truck Traffic | 15% |
| Lanes On Bridge | 2 |
| Last Inspection | May 2024 |
| Inspection Frequency | Every 12 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000012085080 |
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.