Old HWY 21 over Rock CR
Fair Condition20 years old5,438 vehicles/day
Location
| State | Missouri |
| County | Jefferson |
| Location | S 1974 T 43 N R 5 E |
| Carries | Old HWY 21 |
| Crosses | Rock CR |
| Coordinates | 38.42670, -90.47428 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 122.0 ft (37.2 m) |
| Max Span | 113.8 ft (34.7 m) |
| Deck Width | 42.7 ft (13 m) |
| Deck Area | 483.6 sq m |
| Main Spans | 1 |
| Year Built | 2006 |
Traffic
| Avg Daily Traffic | 5,438 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 225 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 31217 |