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Harkins Slough Rd over State Route 1

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

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

Harkins Slough Rd over State Route 1 in Santa Cruz 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 1965, making it 60 years old at the 2025 inventory.
It carries about 4,400 vehicles a day (traffic count year 1998).
Its listed owner is the state highway agency.
It is one of 79 of the 194 inventoried bridges in Santa Cruz County rated good (40.7%); 32 (16.5%) 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 multiple box beam
Length	about 209 ft
Location	05-scr-001-r2.27-wat
NBI structure number	36 0089
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
State Route 1 over Emeline Street	2008	130,000	Fair
Water Street over Branciforte Creek	1924	100,000	Fair
State Route 1 over Soquel Creek Wharf Rd	1947	97,000	Good
State Route 1 over Bay Avenue	1995	97,000	Good
State Route 1 over Market Street	1958	88,000	Good
State Route 1 over Branciforte Creek	1958	88,000	Good