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Territorial Road over Tucannon River

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

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

Territorial Road over Tucannon River in Columbia County, Washington, 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 1998, making it 27 years old at the 2025 inventory.
It carries about 25 vehicles a day (traffic count year 2019).
Its listed owner is the county highway agency.
It is one of 39 of the 86 inventoried bridges in Columbia County rated fair (45.3%); 9 (10.5%) 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 91 ft
Location	0.231 Mi Left SR12
NBI structure number	086402000000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 12 over Touchet River	1966	5,627	Good
US 12 over Touchet River	1966	4,556	Good
US 12 over Warehouse Yard	1933	2,442	Poor
US 12 over UPRR	1977	2,442	Fair
US 12 over Patit Creek	1933	2,218	Fair
US 12 over Whetstone Creek	2021	1,993	Good