Mo 21 N over Rock CR
Good Condition39 years old11,681 vehicles/day
Location
| State | Missouri |
| County | Jefferson |
| Location | S 1974 T 43 N R 5 E |
| Carries | Mo 21 N |
| Crosses | Rock CR |
| Coordinates | 38.42672, -90.47243 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 276.9 ft (84.4 m) |
| Max Span | 56.1 ft (17.1 m) |
| Deck Width | 42.0 ft (12.8 m) |
| Deck Area | 1080.3 sq m |
| Main Spans | 5 |
| Year Built | 1987 |
Traffic
| Avg Daily Traffic | 11,681 (2024) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 2542 |