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U.S. Highway 101 over Austin Creek

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

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

U.S. Highway 101 over Austin Creek in Mendocino County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
It was built in 1964, making it 61 years old at the 2025 inventory.
It carries about 20,900 vehicles a day (traffic count year 2009).
Its listed owner is the state highway agency.
It is one of 124 of the 356 inventoried bridges in Mendocino County rated good (34.8%); 27 (7.6%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	8	Very good condition


Structure	Continuous concrete culvert
Length	about 26 ft
Location	01-men-101-r23.82
NBI structure number	10 0224
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 Pudding Creek	1959	23,950	Good
State Route 001 over Noyo River & Harbor Dr	2005	23,950	Good
North State St over Forsythe Creek	1949	20,200	Fair
U.S. Highway 101 over Ncrra/nwp RR	1957	19,000	Fair
U.S. Highway 101 over Baker Creek	1971	19,000	Good
U.S. Highway 101 over Forsythe Creek	1990	19,000	Fair