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Old Hwy 99 North over Silver Creek

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

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

Old Hwy 99 North over Silver Creek in Skagit County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1934, making it 91 years old at the 2025 inventory.
It carries about 1,687 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 149 of the 256 inventoried bridges in Skagit County rated fair (58.2%); 6 (2.3%) 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

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

Bridge	Built	Vehicles/day	Condition
I-5 over Skagit River	1955	39,245	Fair
I-5 over RR and Cameron Way	1954	37,729	Fair
I-5 over SR 20 BNSF RR & City St	1955	37,394	Good
I-5 over I-5 Drainage	1970	36,919	Good
I-5 over I-5 Drainage	1972	35,558	Fair
I-5 over Hill Ditch	1957	33,686	Fair