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Forest Avenue over Sydney Gulch

Trinity County, California · rated Fair in the 2025 National Bridge Inventory

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

Forest Avenue over Sydney Gulch in Trinity County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1949, making it 76 years old at the 2025 inventory.
It carries about 1,946 vehicles a day (traffic count year 2010).
Its listed owner is the county highway agency.
It is one of 75 of the 194 inventoried bridges in Trinity County rated fair (38.7%); 7 (3.6%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 27 ft
Location	0.2 Mi South of SR 299
NBI structure number	05C0102
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
State Route 299 over East Weaver Creek	1962	7,125	Fair
State Route 299 over Weaver Creek	1953	5,375	Fair
State Route 299 over Little Browns Creek	1999	5,375	Good
State Route 299 over Trinity River	1980	4,450	Fair
State Route 299 over Indian Creek	1974	4,050	Fair
State Route 299 over Gray Creek	1966	3,800	Fair