Home › California › Glenn County › County Road 306 over Branch Stony Creek

County Road 306 over Branch Stony Creek

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

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

County Road 306 over Branch Stony Creek in Glenn County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 4 (poor condition) on the 0-9 scale.
It was built in 1930 and reconstructed in 1970, making it 95 years old at the 2025 inventory.
It carries about 235 vehicles a day (traffic count year 2009).
Its listed owner is the county highway agency.
It is one of 17 of the 240 inventoried bridges in Glenn County rated poor (7.1%); 17 (7.1%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	4	Poor condition


Structure	Continuous concrete culvert
Length	about 21 ft
Location	9.98 Mi N Co Line
NBI structure number	11C0202
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Interstate 5 over Glenn-colusa Drain Ditch	1966	26,000	Good
Interstate 5 over Logan Creek	1970	25,500	Good
Interstate 5 over North Fork Logan Creek	1970	25,500	Good
Interstate 5 SB over Central Irrigation Canal	1966	13,000	Good
Interstate 5 NB over Central Irrigation Canal	1966	13,000	Good
Interstate 5 SB over Cfnr Spur	1966	13,000	Good