M-21 over Maple River
Fair Condition97 years old7,103 vehicles/day
Location
| State | Michigan |
| County | Clinton |
| Location | 2.0 Mi W Of Ovid |
| Carries | M-21 |
| Crosses | Maple River |
| Coordinates | 43.00114, -84.41104 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 39.0 ft (11.9 m) |
| Max Span | 37.4 ft (11.4 m) |
| Deck Width | 47.2 ft (14.4 m) |
| Deck Area | 171.4 sq m |
| Main Spans | 1 |
| Year Built | 1929 (reconstructed 2004) |
Traffic
| Avg Daily Traffic | 7,103 (2007) |
| Truck Traffic | 6% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000001889 |