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Mason Street over Quartermaster Reach

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

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

Mason Street over Quartermaster Reach in San Francisco 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 7 (good condition) on the 0-9 scale.
It was built in 2021, making it 4 years old at the 2025 inventory.
It carries about 1,500 vehicles a day (traffic count year 2024).
It is one of 48 of the 144 inventoried bridges in San Francisco County rated good (33.3%); 20 (13.9%) 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	7	Good condition

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

Bridge	Built	Vehicles/day	Condition
Interstate 80 over Gate San Francisco Bay	2013	265,000	Good
St Rte 101 (5TH St over Bayshore Viaduct	1955	256,700	Fair
Interstate 80 over Yerba Buena Island	1936	248,000	Good
Interstate 80 over Yerba Buena Island	2007	248,000	Good
U.S. Highway 101 over 280/101 Ic - Alemany Cir	1950	234,000	Fair
U.S. Highway 101 over Cesar Chavez Blvd	1951	234,000	Poor