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US Highway 101 over 3RD St 4TH St & 5TH St

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

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

US Highway 101 over 3RD St 4TH St & 5TH St in Sonoma 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 1968 and reconstructed in 2009, making it 57 years old at the 2025 inventory.
It carries about 96,000 vehicles a day (traffic count year 2016).
Its listed owner is the state highway agency.
It is one of 441 of the 611 inventoried bridges in Sonoma County rated fair (72.2%); 32 (5.2%) 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	Continuous concrete multiple box beam
Length	about 757 ft
Location	04-son-101-20.09-sro
NBI structure number	20 0112
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US Highway 101 over College Avenue	2009	136,500	Fair
U.S. Route 101 over Future Rainier Avenue	2022	103,000	Fair
US Highway 101 over Ninth Street	1968	96,000	Fair
U.S. Highway 101 over Santa Rosa Creek	2009	96,000	Fair
U.S. Highway 101 over Sixth Street	2009	96,000	Fair
US Highway 101 over Steele Lane	2009	96,000	Fair