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Mountain House Rd over North Fork Yuba River

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

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

Mountain House Rd over North Fork Yuba River in Sierra 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 1936 and reconstructed in 2000, making it 89 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2000).
Its listed owner is the county highway agency.
It is one of 33 of the 66 inventoried bridges in Sierra County rated fair (50.0%); 4 (6.1%) 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
U.S. Highway 395 over Long Valley Rd	1976	4,600	Good
U.S. Highway 395 over Long Valley Rd	1976	2,300	Good
State Route 89 over Little Truckee River	1982	2,000	Fair
State Route 49 over Smithneck Creek	1965	1,900	Good
State Route 89 over Turner Canyon	1975	1,400	Good
State Route 49 over Downie River	1938	1,200	Good