South Tongass HWY over Front Street Viaduct
FairKetchikan Gateway Borough, Alaska · Mile Point 2.0 · Structure no. 1080
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected June 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 247 ft
- 5 main spans
- Daily traffic
- 8,330
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
South Tongass HWY over Front Street Viaduct is a prestressed concrete tee beam carrying South Tongass HWY over Front Street Viaduct in Ketchikan Gateway Borough, Alaska. It was built in 1969, so it is 56 years old, older than the Alaska average of 35.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 8,330 vehicles a day, roughly 5% of them trucks, projected to reach 10,100 by 2039. The structure is 247 ft (75.3 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was South Tongass HWY over Front Street Viaduct built?
It was built in 1969, making it 56 years old in 2025.
What condition is South Tongass HWY over Front Street Viaduct in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.
How much traffic does South Tongass HWY over Front Street Viaduct carry?
About 8,330 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is South Tongass HWY over Front Street Viaduct?
The structure is 247 ft (75.3 m) long with a longest span of 50 ft (15.2 m) and a deck 60 ft wide.
Who owns South Tongass HWY over Front Street Viaduct?
It is owned by the State Highway Agency.