M-21 over Maple River
Fair Condition29 years old6,505 vehicles/day
Location
| State | Michigan |
| County | Clinton |
| Location | In Ovid |
| Carries | M-21 |
| Crosses | Maple River |
| Coordinates | 43.00085, -84.37022 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 90.9 ft (27.7 m) |
| Max Span | 88.3 ft (26.9 m) |
| Deck Width | 47.2 ft (14.4 m) |
| Deck Area | 398.9 sq m |
| Main Spans | 1 |
| Year Built | 1997 |
Traffic
| Avg Daily Traffic | 6,505 (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 | 000000000001891 |