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King Grade over Tucannon River

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

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

King Grade over Tucannon River in Columbia County, Washington, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1974, making it 51 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 9 of the 86 inventoried bridges in Columbia County rated poor (10.5%); 9 (10.5%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 79 ft
Location	00.20 Mi S CR 9233
NBI structure number	080875000000000
Condition class	Poor

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