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State Route 1 over Redwood Creek

Marin County, California · rated Poor in the 2025 National Bridge Inventory

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

State Route 1 over Redwood Creek in Marin County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 4 (poor condition) on the 0-9 scale.
It was built in 1926 and reconstructed in 1970, making it 99 years old at the 2025 inventory.
It carries about 3,800 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 16 of the 207 inventoried bridges in Marin County rated poor (7.7%); 16 (7.7%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	4	Poor condition


Structure	Continuous concrete culvert
Length	about 40 ft
Location	04-mrn-001-6.02
NBI structure number	27 0019
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US Highway 101 over North San Pedro Road	1979	180,000	Fair
U.S. Highway 101 over Lincoln Ave-n101 on Ramp	1938	180,000	Fair
U.S. Highway 101 over Linden Lane	1947	173,000	Good
U.S. Highway 101 over Ggt Bellam Andersen	1958	172,000	Good
U.S. Highway 101 over Corte Madera CR & Sfd Bl	1957	172,000	Fair
U.S. Highway 101 over Wornum Drive	1929	172,000	Good