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Idaho Maryland Rd over Wolf Creek

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

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

Idaho Maryland Rd over Wolf Creek in Nevada County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1977, making it 48 years old at the 2025 inventory.
It carries about 6,604 vehicles a day (traffic count year 2011).
Its listed owner is a city or municipal highway agency.
It is one of 55 of the 137 inventoried bridges in Nevada County rated fair (40.1%); 19 (13.9%) 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

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

Bridge	Built	Vehicles/day	Condition
State Route 20 over Idaho-maryland Road	1969	47,000	Fair
State Route 20 over Wolf Creek	1969	47,000	Good
State Route 20 over SR 174 (colfax) Auburn	1970	43,000	Good
State Route 20 over Bank Street	1969	34,500	Good
State Route 20 over Bennett Street	1969	34,500	Fair
Interstate 80 over Donner Pass Road	1991	34,000	Fair