M-21 over Grand Rapids Eastern Rr
Good Condition49 years old29,250 vehicles/day
Location
| State | Michigan |
| County | Kent |
| Location | 3.5 Mi W Of Ada |
| Carries | M-21 |
| Crosses | Grand Rapids Eastern Rr |
| Coordinates | 42.96282, -85.55706 |
Condition Ratings
| Overall Condition | Good |
| Deck | 8 (Very Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 224.7 ft (68.5 m) |
| Max Span | 75.1 ft (22.9 m) |
| Deck Width | 90.6 ft (27.6 m) |
| Deck Area | 1890.6 sq m |
| Main Spans | 3 |
| Year Built | 1977 (reconstructed 2015) |
Traffic
| Avg Daily Traffic | 29,250 (2015) |
| Truck Traffic | 4% |
| Lanes On Bridge | 5 |
Inspection & Ownership
| Last Inspection | November 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000004858 |