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SR 509 N-n Ramp over Terrain

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

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

SR 509 N-n Ramp over Terrain in Pierce 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 1996, making it 29 years old at the 2025 inventory.
It carries about 6,673 vehicles a day (traffic count year 2012).
Its listed owner is the state highway agency.
It is one of 267 of the 480 inventoried bridges in Pierce County rated good (55.6%); 22 (4.6%) 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 prestressed concrete multiple box beam
Length	about 199 ft
Location	Jct I-705
NBI structure number	0014747B0000000
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 Portland Ave	1962	105,864	Fair
I-5 over Portland Ave	1962	105,864	Fair
I-5 over Wapato Creek	1960	97,641	Good
I-5 over Wapato Creek	1960	97,641	Good
I-5 over Hylebos Creek	1960	96,536	Good
I-5 over Hylebos Creek	1960	96,536	Good