M-28 over Rock River
Fair Condition94 years old3,093 vehicles/day
Location
| State | Michigan |
| County | Alger |
| Location | 5.1 Mi NW Of Au Train |
| Carries | M-28 |
| Crosses | Rock River |
| Coordinates | 46.46382, -86.91603 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 40.0 ft (12.2 m) |
| Max Span | 38.4 ft (11.7 m) |
| Deck Width | 49.9 ft (15.2 m) |
| Deck Area | 185.4 sq m |
| Main Spans | 1 |
| Year Built | 1932 (reconstructed 1975) |
Traffic
| Avg Daily Traffic | 3,093 (2007) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 524 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000000046 |