Structure 18143 · Livingston County, MO
Carries County RD 230 over Blackwell CR, S 20 T 58 N R 23 W.
Set by its lowest-rated component: Deck and Substructure at 5 of 9.
How ratings work25 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 | Missouri |
| County | Livingston |
| Location | S 20 T 58 N R 23 W |
| Carries | County RD 230 |
| Crosses | Blackwell CR |
| Coordinates | 39.81954, -93.51158 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 23.0 ft (7 m) |
| Deck Width | 18.4 ft (5.6 m) |
| Deck Area | 42.6 sq m |
| Main Spans | 1 |
| Year Built | 1955 |
| Avg Daily Traffic | 35 (2024) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
| Last Inspection | January 2025 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 18143 |
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.