Us-23 over Thunder Bay River
Fair Condition94 years old16,200 vehicles/day
Location
| State | Michigan |
| County | Alpena |
| Location | In Alpena |
| Carries | Us-23 |
| Crosses | Thunder Bay River |
| Coordinates | 45.07461, -83.44810 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 183.4 ft (55.9 m) |
| Max Span | 58.1 ft (17.7 m) |
| Deck Width | 70.9 ft (21.6 m) |
| Deck Area | 1207.4 sq m |
| Main Spans | 3 |
| Year Built | 1932 (reconstructed 1998) |
Traffic
| Avg Daily Traffic | 16,200 (2007) |
| Truck Traffic | 2% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | 523 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000000335 |