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Sir Francis Drake over Lagunitas Creek

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

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

Sir Francis Drake over Lagunitas 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 deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1964, making it 61 years old at the 2025 inventory.
It carries about 25,582 vehicles a day (traffic count year 2018).
Its listed owner is the county 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


Structure	Continuous concrete tee beam
Length	about 192 ft
Location	1.9 Mi E SR 1 at Olema
NBI structure number	27C0018
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