M-25 over Black River Spillway
Fair Condition26 years old40,250 vehicles/day
Location
| State | Michigan |
| County | St. Clair |
| Location | In Port Huron |
| Carries | M-25 |
| Crosses | Black River Spillway |
| Coordinates | 43.01644, -82.45078 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 165.0 ft (50.3 m) |
| Max Span | 75.8 ft (23.1 m) |
| Deck Width | 85.6 ft (26.1 m) |
| Deck Area | 1312.8 sq m |
| Main Spans | 3 |
| Year Built | 2000 |
Traffic
| Avg Daily Traffic | 40,250 (2019) |
| Truck Traffic | 2% |
| Lanes On Bridge | 5 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000009981 |