Us-31 NB over Black River
Fair Condition77 years old23,373 vehicles/day
Location
| State | Michigan |
| County | Ottawa |
| Location | 0.4 Mi N Of M-21 |
| Carries | Us-31 NB |
| Crosses | Black River |
| Coordinates | 42.80089, -86.08331 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 240.2 ft (73.2 m) |
| Max Span | 100.1 ft (30.5 m) |
| Deck Width | 48.6 ft (14.8 m) |
| Deck Area | 1083.4 sq m |
| Main Spans | 3 |
| Year Built | 1949 (reconstructed 1984) |
Traffic
| Avg Daily Traffic | 23,373 (2020) |
| Truck Traffic | 7% |
| 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 | 000000000008689 |