Comstock Road over Black River
Fair Condition30 years old1,025 vehicles/day
Location
| State | Michigan |
| County | St. Clair |
| Location | Sec 17 Grant Twp |
| Carries | Comstock Road |
| Crosses | Black River |
| Coordinates | 43.12289, -82.61672 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 242.8 ft (74 m) |
| Max Span | 81.0 ft (24.7 m) |
| Deck Width | 37.4 ft (11.4 m) |
| Deck Area | 843.6 sq m |
| Main Spans | 3 |
| Year Built | 1996 |
Traffic
| Avg Daily Traffic | 1,025 (1994) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | 000000000010077 |