Home › Washington › Columbia County › Thorn Hollow Road over Whetstone Creek

Thorn Hollow Road over Whetstone Creek

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

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

Thorn Hollow Road over Whetstone Creek in Columbia County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2015, making it 10 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 38 of the 86 inventoried bridges in Columbia County rated good (44.2%); 9 (10.5%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 41 ft
Location	0.03 Miles SE JCT 25860
NBI structure number	088819000000000
Condition class	Good

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