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U.S. Highway 97 over Whitney Creek

Siskiyou County, California · rated Fair in the 2025 National Bridge Inventory

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

U.S. Highway 97 over Whitney Creek in Siskiyou County, California, 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 1982, making it 43 years old at the 2025 inventory.
It carries about 5,000 vehicles a day (traffic count year 2015).
Its listed owner is the state highway agency.
It is one of 230 of the 425 inventoried bridges in Siskiyou County rated fair (54.1%); 25 (5.9%) 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

Component	Rating (2025)	FHWA scale meaning
Superstructure	6	Satisfactory condition
Substructure	7	Good condition

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

Bridge	Built	Vehicles/day	Condition
Interstate 5 SB over UP RR & Amtrak	1964	20,000	Fair
Interstate 5 NB over UP RR & Amtrak	1964	20,000	Fair
Interstate 5 over Mott Road	1976	20,000	Good
Interstate 5 over Mott Road	1976	20,000	Fair
Interstate 5 over Dunsmuir Ave	1976	19,200	Good
Interstate 5 over Sacramento UP RR Amtrak	1955	18,000	Good