Grant Street over Grant Street Viaduct
Ketchikan Gateway Borough, Alaska · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Grant Street over Grant Street Viaduct in Ketchikan Gateway Borough, Alaska, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1970, making it 55 years old at the 2025 inventory.
- It carries about 1,016 vehicles a day (traffic count year 2018).
- Its listed owner is a city or municipal highway agency.
- It is one of 45 of the 107 inventoried bridges in Ketchikan Gateway Borough rated fair (42.1%); 12 (11.2%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated June 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (55.3441, -131.6451)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 212 ft |
| Location | Mile Point 0.1 |
| NBI structure number | 0384 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.
Busiest bridges in Ketchikan Gateway Borough
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| South Tongass Hwy over Tongass Avenue Viaduct | 1956 | 14,564 | Fair |
| South Tongass Hwy over Water St Viaduct | 1955 | 14,046 | Poor |
| South Tongass Hwy over Hoadley Creek | 1957 | 11,900 | Poor |
| North Tongass Hwy over Carlanna Creek | 1973 | 9,210 | Fair |
| South Tongass Hwy over Front Street Viaduct | 1969 | 8,330 | Fair |
| South Tongass Hwy over Ketchikan Creek | 1944 | 6,850 | Fair |
All bridges nearby: Ketchikan Gateway Borough, AK bridge conditions · every bridge in Ketchikan Gateway Borough · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.