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Hirschdale Rd over Truckee River

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

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

Hirschdale Rd over Truckee River in Nevada County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1926, making it 99 years old at the 2025 inventory.
It carries about 70 vehicles a day (traffic count year 2016).
Its listed owner is the county highway agency.
It is one of 19 of the 137 inventoried bridges in Nevada County rated poor (13.9%); 19 (13.9%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Continuous concrete tee beam
Length	about 250 ft
Location	at Hinton
NBI structure number	17C0045
Condition class	Poor

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