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Dillon Road over Salt River

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

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

Dillon Road over Salt River in Humboldt County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
It was built in 1994, making it 31 years old at the 2025 inventory.
It carries about 371 vehicles a day (traffic count year 2014).
Its listed owner is the county highway agency.
It is one of 169 of the 399 inventoried bridges in Humboldt County rated good (42.4%); 21 (5.3%) 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 prestressed concrete multiple box beam
Length	about 241 ft
Location	N of Port Kenyon Rd
NBI structure number	04C0012
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
U.S. Highway 101 over Orchard Ave	1963	25,700	Good
US Highway 101 SB over Palmer Blvd	1958	22,000	Fair
US Highway 101 NB over Palmer Blvd	1958	22,000	Fair
U.S. Highway 101 over US 101 On&off Ramp Ncrra	1962	21,700	Fair
U.S. Highway 101 over Salmon Creek	1957	21,500	Good
U.S. Highway 101 over Finch Creek Road	1958	21,500	Good