Structure 54056158 · Potter County, SD
Carries IRR Us212 over Missouri Rv (oahe Lk), Dewey - Potter Co. Line.
4,619 ft end to end, longest span 450 ft: about 13 football fields. 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 through truss.
| State | South Dakota |
| County | Potter |
| Location | Dewey - Potter Co. Line |
| Carries | IRR Us212 |
| Crosses | Missouri Rv (oahe Lk) |
| Coordinates | 45.01143, -100.29386 |
| Material | Steel Continuous |
| Design | Truss - Thru |
| Total Length | 4619.4 ft (1,408 m) |
| Max Span | 449.8 ft (137.1 m) |
| Deck Width | 28.5 ft (8.7 m) |
| Deck Area | 12249.6 sq m |
| Main Spans | 7 |
| Year Built | 1958 (reconstructed 1980) |
| Avg Daily Traffic | 521 (2024) |
| Truck Traffic | 27% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 12 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000054056158 |
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.