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Oroville Chico Hwy over Nance Canyon

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

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

Oroville Chico Hwy over Nance Canyon in Butte 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 1920 and reconstructed in 1975, making it 105 years old at the 2025 inventory.
It carries about 300 vehicles a day (traffic count year 2018).
Its listed owner is the county highway agency.
It is one of 24 of the 440 inventoried bridges in Butte County rated poor (5.5%); 24 (5.5%) 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	Steel stringer or multi-beam girder
Length	about 48 ft
Location	at Mesa Road
NBI structure number	12C0030
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Skyway over State Route 99	1965	37,400	Good
State Route 99 over Dry Channel	1953	32,600	Good
State Route 99 over Scrub Creek	1952	28,250	Good
State Route 99 over Nance Canyon	1952	28,250	Good
Cohasset Hwy over State Route 99	1966	27,008	Good
State Route 99 SB over Little Chico Creek	1965	24,750	Fair