Structure 20303000010097 · Custer County, SD
Carries Fdr 345 over Iron Creek, T 2 S R 6 E Sec 31.
Set by its lowest-rated component: Superstructure and Substructure at 7 of 9.
How ratings work23 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 | Custer |
| Location | T 2 S R 6 E Sec 31 |
| Carries | Fdr 345 |
| Crosses | Iron Creek |
| Coordinates | 43.83867, -103.44821 |
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 23.3 ft (7.1 m) |
| Max Span | 21.7 ft (6.6 m) |
| Deck Width | 15.4 ft (4.7 m) |
| Deck Area | 33.4 sq m |
| Main Spans | 1 |
| Year Built | 1956 (reconstructed 1986) |
| Avg Daily Traffic | 25 (1992) |
| Lanes On Bridge | 1 |
| Last Inspection | July 2023 |
| Inspection Frequency | Every 24 months |
| Owner | U.S. Forest Service |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 4 — Foundations need monitoring |
| Structure Number | 020303000010097 |
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.