Mo 21 S over Knob CR
Fair Condition59 years old6,248 vehicles/day
Location
| State | Missouri |
| County | Iron |
| Location | S 30 T 34 N R 4 E |
| Carries | Mo 21 S |
| Crosses | Knob CR |
| Coordinates | 37.61783, -90.64203 |
Condition Ratings
| Overall Condition | Fair |
| Channel/Waterway | 7 (Good) |
| Culvert | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 60.4 ft (18.4 m) |
| Max Span | 11.2 ft (3.4 m) |
| Deck Area | 224.5 sq m |
| Main Spans | 3 |
| Year Built | 1967 |
Traffic
| Avg Daily Traffic | 6,248 (2024) |
| Truck Traffic | 18% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 1090 |