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Thorne Bay Road over Thorne River

Prince of Wales-Hyder Census Area, Alaska · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Thorne Bay Road over Thorne River in Prince of Wales-Hyder Census Area, Alaska, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1975, making it 50 years old at the 2025 inventory.
It carries about 190 vehicles a day (traffic count year 2020).
Its listed owner is the state highway agency.
It is one of 79 of the 226 inventoried bridges in Prince of Wales-Hyder Census Area rated fair (35.0%); 16 (7.1%) are rated poor.
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.

Component ratings


Structure	Continuous steel girder and floorbeam
Length	about 164 ft
Location	Mile Point 13.0
NBI structure number	1462
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.

Bridge	Built	Vehicles/day	Condition
Irr:craig/klwk Hwy over Klawock River	1990	1,990	Fair
Craig/klawock/holl over Crab Creek Culvert	1985	1,200	Poor
Big Salt Lake Road over Bennett Creek	1985	680	Good
Big Salt Lake Road over Steelhead River	1998	400	Good
Salmon River Road over Fish Creek	1965	390	Fair
N Prince of Wales over Yatuk Creek	1990	340	Good