Us-31 over Big Sable River
Fair Condition67 years old6,578 vehicles/day
Location
| State | Michigan |
| County | Mason |
| Location | 4.9 Mi S Of Manistee Col |
| Carries | Us-31 |
| Crosses | Big Sable River |
| Coordinates | 44.12048, -86.27998 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 59.7 ft (18.2 m) |
| Max Span | 59.7 ft (18.2 m) |
| Deck Width | 46.9 ft (14.3 m) |
| Deck Area | 260.3 sq m |
| Main Spans | 1 |
| Year Built | 1959 |
Traffic
| Avg Daily Traffic | 6,578 (2007) |
| Truck Traffic | 8% |
| 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 | 000000000006642 |