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State Route 70 over Humbug Creek

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

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

State Route 70 over Humbug Creek in Plumas County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1969, making it 56 years old at the 2025 inventory.
It carries about 6,200 vehicles a day (traffic count year 2009).
Its listed owner is the state highway agency.
It is one of 43 of the 165 inventoried bridges in Plumas County rated good (26.1%); 5 (3.0%) 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

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

Bridge	Built	Vehicles/day	Condition
Gulling Street over UP RR & BNSF Ry	1954	10,046	Fair
Gulling Street over Middle Fork Feather Riv	1954	10,046	Poor
State Route 70 over Spanish Creek	1964	6,700	Fair
State Route 70 over Clear Stream	1937	6,700	Good
State Route 36 over North Fork Feather River	1966	5,500	Fair
State Route 36 over Bailey Creek	1966	5,000	Good