South Tongass HWY over Tongass Avenue Viaduct
Fair Condition70 years old14,564 vehicles/day
Location
| State | Alaska |
| County | Ketchikan Gateway |
| Location | Mile Point 1.3 |
| Carries | South Tongass HWY |
| Crosses | Tongass Avenue Viaduct |
| Coordinates | 55.34611, -131.66028 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Tee Beam |
| Total Length | 1727.0 ft (526.4 m) |
| Max Span | 42.0 ft (12.8 m) |
| Deck Width | 53.1 ft (16.2 m) |
| Deck Area | 8527.7 sq m |
| Main Spans | 58 |
| Year Built | 1956 |
Traffic
| Avg Daily Traffic | 14,564 (2018) |
| Truck Traffic | 8% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0997 |