Herron Road over Thunder Bay River
Fair Condition54 years old300 vehicles/day
Location
| State | Michigan |
| County | Alpena |
| Location | 0.3 Mi S Of Fas RTE 191 |
| Carries | Herron Road |
| Crosses | Thunder Bay River |
| Coordinates | 45.12415, -83.63514 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 139.8 ft (42.6 m) |
| Max Span | 59.7 ft (18.2 m) |
| Deck Width | 30.5 ft (9.3 m) |
| Deck Area | 396.2 sq m |
| Main Spans | 3 |
| Year Built | 1972 |
Traffic
| Avg Daily Traffic | 300 (2010) |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 824 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000000347 |