Low clearance bridges in San Mateo County, California

11 spots where an interstate or US highway in San Mateo County has less than 16 ft of clearance, lowest first. The lowest is 14 ft 8 in on I-380, 04-SM-280-R20.97-SBR. 5 are under 15 ft.

Posted signs and your permit come first. These are the clearances California reported to the federal National Bridge Inventory in 2025. Repaving, snow and new work can lower them.

14 ft 8 in under I-280 · I-380 14 ft 8 in under N101-BAYSHORE Off · US-101 14 ft 9 in under Maple Street · US-101 14 ft 9 in under Whipple Avenue · US-101 14 ft 11 in under St Charles Avenue · I-280 15 ft 1 in under Caltrain & Union Pacific Railroad · US-101 15 ft 1 in under Third Avenue · US-101 15 ft 5 in under Holly Street · US-101 15 ft 5 in under University Avenue SB · US-101 15 ft 8 in under Junipero SERRA-NB1 · I-280 15 ft 10 in under University Avenue NB · US-101

Clearance	Where	Highway
14 ft 8 in	Under I-280 · 04-SM-280-R20.97-SBR · Map	I-380
14 ft 8 in	Under N101-BAYSHORE Off · 04-SM-101-23.39-SSF · Map	US-101
14 ft 9 in	Under Maple Street · 04-SM-101-5.88-RDWC · Map	US-101
14 ft 9 in	Under Whipple Avenue · 04-SM-101-6.62-RDWC · Map	US-101
14 ft 11 in	Under St Charles Avenue · 04-SM-280-M27.41L-DLC · Map	I-280
15 ft 1 in	Under Caltrain & Union Pacific Railroad · 04-SM-101-3.05-MLP · Map	US-101
15 ft 1 in	Under Third Avenue · 04-SM-101-13.46-SM · Map	US-101
15 ft 5 in	Under Holly Street · 04-SM-101-8.40 · Map	US-101
15 ft 5 in	Under University Avenue SB · 04-SM-101-0.89-EAPA · Map	US-101
15 ft 8 in	Under Junipero SERRA-NB1 · 04-SM-001-R48.38-DLC · Map	I-280
15 ft 10 in	Under University Avenue NB · 04-SM-101-0.88-EAPA · Map	US-101