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Thomason Lane over Little Weiser River

Washington County, Idaho · rated Fair in the 2025 National Bridge Inventory

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

Thomason Lane over Little Weiser River in Washington County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1996, making it 29 years old at the 2025 inventory.
It carries about 60 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 50 of the 80 inventoried bridges in Washington County rated fair (62.5%); 4 (5.0%) 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	Prestressed concrete tee beam
Length	about 90 ft
Location	0.5 S. 5.8 E. Cambridge
NBI structure number	000000000028886
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 95 over Robertson Slough	2017	7,800	Good
US 95 over Weiser River	2013	7,700	Fair
US 95 over Monroe Creek	1999	5,600	Good
US 95 over Galloway Canal	1999	5,600	Good
US 95 over Manns Creek	2004	4,400	Fair
US 95 over Sage Creek	1964	4,400	Fair