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I-405 over SR 524 (filbert Rd)

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

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

I-405 over SR 524 (filbert Rd) in Snohomish 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 7 (good condition) on the 0-9 scale.
It was built in 1968 and reconstructed in 2001, making it 57 years old at the 2025 inventory.
It carries about 61,143 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 248 of the 500 inventoried bridges in Snohomish County rated good (49.6%); 20 (4.0%) 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	Continuous concrete multiple box beam
Length	about 337 ft
Location	2.9 N Jct SR 527
NBI structure number	0011598B0000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-5 over 212TH St SW	1963	98,485	Fair
I-5 over 212TH St SW	1963	98,485	Fair
I-5 over 52ND Ave W	1963	98,485	Good
I-5 over 52ND Ave W	1963	98,485	Fair
I-5 over Lowell Road	1950	94,939	Good
I-5 over Lowell Road	1967	94,939	Good