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Rd 304 over Whitehead Slough

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

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

Rd 304 over Whitehead Slough in Lassen County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1930 and reconstructed in 1978, making it 95 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 1979).
Its listed owner is the county highway agency.
It is one of 8 of the 108 inventoried bridges in Lassen County rated poor (7.4%); 8 (7.4%) 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	Timber stringer or multi-beam girder
Length	about 60 ft
Location	0.9 Mi E/o Rd 302
NBI structure number	07C0052
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 36 over Susan River	1964	15,300	Fair
State Route 36 over Jensen Slough	1964	15,300	Good
State Route 36 over Gold Run Creek	1964	10,300	Good
U.S. Highway 395 over Long Valley Creek	1956	5,500	Fair
U.S. Highway 395 over UP RR & BNSF Ry	1969	5,500	Fair
U.S. Highway 395 over Long Valley Creek Ovfl	1969	5,500	Fair