Structure 3004 · St. Louis County, MO
Carries Is 64 W over Cst Clayton AVE Is 64, S 16 T 45 N R 7 E.
5,403 ft end to end, longest span 121 ft: about 15 football fields, or 1.0 miles. 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 | St. Louis |
| Location | S 16 T 45 N R 7 E |
| Carries | Is 64 W |
| Crosses | Cst Clayton AVE Is 64 |
| Coordinates | 38.63212, -90.23793 |
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 5402.9 ft (1646.8 m) |
| Max Span | 121.1 ft (36.9 m) |
| Deck Width | 54.8 ft (16.7 m) |
| Deck Area | 27501.6 sq m |
| Main Spans | 56 |
| Year Built | 1982 |
| Avg Daily Traffic | 45,038 (2024) |
| Truck Traffic | 18% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 18 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Not applicable |
| Structure Number | 3004 |
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.