M-21 over Grand River
Good Condition16 years old23,900 vehicles/day
Location
| State | Michigan |
| County | Kent |
| Location | 6.4 Mi E Of I-96 |
| Carries | M-21 |
| Crosses | Grand River |
| Coordinates | 42.95531, -85.47454 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 480.0 ft (146.3 m) |
| Max Span | 82.7 ft (25.2 m) |
| Deck Width | 83.3 ft (25.4 m) |
| Deck Area | 3716.0 sq m |
| Main Spans | 6 |
| Year Built | 2010 |
Traffic
| Avg Daily Traffic | 23,900 (2009) |
| Truck Traffic | 4% |
| Lanes On Bridge | 4 |
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 | 000000000004854 |