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Big Trees Parkway over N Fork Stanislaus River

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

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

Big Trees Parkway over N Fork Stanislaus River in Calaveras 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 3 (serious condition) on the 0-9 scale.
It was built in 1959, making it 66 years old at the 2025 inventory.
It carries about 400 vehicles a day (traffic count year 2010).
It is one of 6 of the 108 inventoried bridges in Calaveras County rated poor (5.6%); 6 (5.6%) 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 242 ft
Location	Calav Big Trees St Pk
NBI structure number	30P0001
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 4 over Murphys Grade Road	2009	9,150	Good
State Route 4 over Angels Creek	2009	9,150	Good
State Route 49 over Angels Creek	1909	9,100	Fair
State Route 49 over Cherokee Creek	1941	8,050	Good
State Route 12 over Lime Creek	1939	8,000	Fair
State Route 4 over Waterman Creek	1941	7,900	Fair