Csah 21 over Big Cobb River
Fair Condition54 years old176 vehicles/day
Location
| State | Minnesota |
| County | Blue Earth |
| Location | 1.4 Mi E Of Jct Csah 52 |
| Carries | Csah 21 |
| Crosses | Big Cobb River |
| Coordinates | 43.93515, -93.86927 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Channel Beam |
| Total Length | 93.2 ft (28.4 m) |
| Max Span | 31.2 ft (9.5 m) |
| Deck Width | 38.1 ft (11.6 m) |
| Deck Area | 329.4 sq m |
| Main Spans | 3 |
| Year Built | 1972 |
Traffic
| Avg Daily Traffic | 176 (2021) |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 07530 |