Home › California › Sonoma County › River Rd over Hillside

River Rd over Hillside

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

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

River Rd over Hillside in Sonoma 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 1971, making it 54 years old at the 2025 inventory.
It carries about 10,300 vehicles a day (traffic count year 2015).
Its listed owner is the county highway agency.
It is one of 138 of the 611 inventoried bridges in Sonoma County rated good (22.6%); 32 (5.2%) 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


Structure	Continuous concrete tee beam
Length	about 219 ft
Location	0.3 Mi E/o Canyon 7 Rd.
NBI structure number	20C0103
Condition class	Good

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 3RD St 4TH St & 5TH St	1968	96,000	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