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State Route 4 over North Fork Mokelumne Riv

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

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

State Route 4 over North Fork Mokelumne Riv in Alpine 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 1937 and reconstructed in 1986, making it 88 years old at the 2025 inventory.
It carries about 490 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 10 of the 33 inventoried bridges in Alpine County rated good (30.3%); 2 (6.1%) 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
State Route 88 over West Fork Carson River	1952	3,225	Fair
Old State Route 88 over West Fork Carson River	1939	3,200	Fair
State Route 89 over West Fork Carson River	1960	3,200	Fair
State Route 88 over West Fork Carson River	1963	3,200	Good
State Route 88 over West Fork Carson River	1963	3,200	Good
State Route 89 over Wildlife Access	1980	3,050	Good