Structure 4546 · Butler County, MO
Carries RT O S over Wilby CR, S 32 T 26 N R 6 E.
Set by its lowest-rated component: Deck and Superstructure at 5 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 | Butler |
| Location | S 32 T 26 N R 6 E |
| Carries | RT O S |
| Crosses | Wilby CR |
| Coordinates | 36.86402, -90.43285 |
| Material | Concrete |
| Design | Slab |
| Total Length | 23.0 ft (7 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 20.3 ft (6.2 m) |
| Deck Area | 43.4 sq m |
| Main Spans | 1 |
| Year Built | 1921 |
| Avg Daily Traffic | 312 (2024) |
| Truck Traffic | 11% |
| Lanes On Bridge | 2 |
| Last Inspection | February 2025 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 4546 |
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.