Structure 4575 · Iron County, MO
Carries Mo 32 E over Richardson CR, S 218 T 35 N R 2 E.
Set by its lowest-rated component: Superstructure and Substructure at 4 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 slab bridge.
| State | Missouri |
| County | Iron |
| Location | S 218 T 35 N R 2 E |
| Carries | Mo 32 E |
| Crosses | Richardson CR |
| Coordinates | 37.70676, -90.79744 |
| Material | Concrete |
| Design | Slab |
| Total Length | 22.6 ft (6.9 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 21.0 ft (6.4 m) |
| Deck Area | 44.2 sq m |
| Main Spans | 1 |
| Year Built | 1922 |
| Avg Daily Traffic | 860 (2024) |
| Truck Traffic | 24% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 4575 |
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.