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Bridge conditions in San Francisco County, California

144 inventoried bridges · 20 rated poor · 2025 National Bridge Inventory

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

Of the 144 San Francisco County bridges in the federal inventory, 20 carry a poor rating. That 13.9% share is roughly 2x the national average.

20 of the 144 bridges in San Francisco County, California, are rated in poor condition (13.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
48 bridges (33.3%) are rated good and 76 (52.8%) fair.
The median San Francisco County bridge was built in 1964.
The busiest poor-rated bridge is U.S. Highway 101 over Cesar Chavez Blvd (built 1951), carrying about 234,000 vehicles a day.

Good 33.3% · Fair 52.8% · Poor 13.9% of 144 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
U.S. Highway 101 over Cesar Chavez Blvd	1951	234,000	Poor
NB and SB Rte 280 over Lyell Street	1964	170,000	Poor
I 280 N Al Line over 280/101 Interchange	1960	170,000	Poor
I 280 over San Jose & Sickles Ave	1964	166,000	Poor
101 and 280 over 280/101 Interchange	1960	153,800	Poor
Interstate 280 over Alemany Blvd	1966	132,000	Poor
I 280 - 101S (wu) over 280/101 Interchange	1960	80,000	Poor
I 280 S Au Line over 280/101 Interchange	1960	80,000	Poor
S280-s101 Connectr over N101-n280 Connector Ramp	1966	40,000	Poor
Bayshore Blvd over Route 101	1970	33,111	Poor
Evans Ave over Caltrain & UP RR	1947	30,000	Poor
Geneva Ave over Route I 280	1964	26,805	Poor
Mariposa St over Caltrain & UP RR	1968	20,000	Poor
I280S Off-monterey over I 280 San Jose Muni Bart	1964	11,200	Poor
Williams Avenue over Caltrain & UP RR	1936	10,200	Poor
Alemany Blvd NB over Route I 280	1963	10,055	Poor
18TH Street over Route 280	1968	7,000	Poor
Justin Drive over Route I 280	1963	5,512	Poor
Treasure Isd Rd NB over Treasure Isd Rd SB	1964	1,500	Poor
Treasure Isd Rd SB over Sidehill Ti Rd NB	1964	1,500	Poor

Busiest bridges in the county

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
U.S. Highway 101 over Cortland Avenue	1950	234,000	Fair
Interstate 80 over San Francisco Bay 3 Sts	1936	200,000	Fair
U.S. Highway 101 over Alana Way	1954	199,000	Fair
U.S. Highway 101 over Blanken Ave	1954	199,000	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

All of California: California bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.