Structure 4600 · St. Charles County, MO
Carries Is 70 E over Sandford CR, S 34 T 47 N R 4 E.
A culvert 22 ft across with 2 openings. 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, so those are drawn as typical for a culvert.
| State | Missouri |
| County | St. Charles |
| Location | S 34 T 47 N R 4 E |
| Carries | Is 70 E |
| Crosses | Sandford CR |
| Coordinates | 38.78989, -90.55037 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 22.0 ft (6.7 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Area | 220.4 sq m |
| Main Spans | 2 |
| Year Built | 1953 (reconstructed 1961) |
| Avg Daily Traffic | 122,262 (2024) |
| Truck Traffic | 12% |
| Lanes On Bridge | 5 |
| Last Inspection | November 2023 |
| 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 | 4600 |
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.