Birch Street over Birch Street Viaduct
Fair Condition66 years old200 vehicles/day
Location
| State | Alaska |
| County | Petersburg |
| Location | Mile Point 0.1 |
| Carries | Birch Street |
| Crosses | Birch Street Viaduct |
| Coordinates | 56.80996, -132.95586 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 704.4 ft (214.7 m) |
| Max Span | 13.1 ft (4 m) |
| Deck Width | 14.1 ft (4.3 m) |
| Deck Area | 923.2 sq m |
| Main Spans | 70 |
| Year Built | 1960 (reconstructed 1979) |
Traffic
| Avg Daily Traffic | 200 (2018) |
| Truck Traffic | 1% |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | 523 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 1453 |