Home › California › Nevada County › Donner Pass Road over Trout Creek

Donner Pass Road over Trout Creek

Nevada County, California · rated Good in the 2025 National Bridge Inventory

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

Donner Pass Road over Trout Creek in Nevada County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
It was built in 2006, making it 19 years old at the 2025 inventory.
It carries about 9,000 vehicles a day (traffic count year 2013).
Its listed owner is a town or township highway agency.
It is one of 63 of the 137 inventoried bridges in Nevada County rated good (46.0%); 19 (13.9%) 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

Component	Rating (2025)	FHWA scale meaning
Superstructure	7	Good condition
Substructure	8	Very good condition

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

Bridge	Built	Vehicles/day	Condition
State Route 20 over Idaho-maryland Road	1969	47,000	Fair
State Route 20 over Wolf Creek	1969	47,000	Good
State Route 20 over SR 174 (colfax) Auburn	1970	43,000	Good
State Route 20 over Bank Street	1969	34,500	Good
State Route 20 over Bennett Street	1969	34,500	Fair
Interstate 80 over Donner Pass Road	1991	34,000	Fair