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SR 3 over Mill Creek

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

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

SR 3 over Mill Creek in Mason 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 1921 and reconstructed in 1966, making it 104 years old at the 2025 inventory.
It carries about 15,354 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 55 of the 136 inventoried bridges in Mason County rated fair (40.4%); 4 (2.9%) 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 concrete tee beam
Length	about 128 ft
Location	0.9 N Jct US 101
NBI structure number	0000451A0000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 101 over Mill Creek	1973	19,397	Good
US 101 over Creek/rr/street	1973	18,182	Fair
US 101 over Matlock Rd	1973	18,182	Poor
SR 3 over Goldsborough Creek	1923	17,285	Fair
US 101 over SR 3	1972	17,050	Fair
SR 3 over Deer Creek	1957	15,878	Good