Accident High Severity Resolved

CHP : Traffic Collision on US-101 Southbound south of Marsh Rd (Menlo Park). Off Ramp affected. Expect delays.

A high-severity accident was reported on US-101 S near San Mateo on October 31, 2026 at 5:33 PM.

Road

US-101 S

Area

San Mateo

Address

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Started

Oct 31, 10:33 AM

Last Updated

1 day ago

Oct 31, 10:45 AM

Resolved

Oct 31, 5:00 PM

Coordinates

37.4844, -122.1843

Update History

2 observations

CHP : Traffic Collision on US-101 Southbound south of Marsh Rd (Menlo Park). Off Ramp affected. Expect delays. Oct 31, 10:45 AM

CHP : Traffic Collision on US-101 Southbound south of Marsh Rd (Menlo Park). Right shoulder affected. Expect delays. Oct 31, 10:15 AM

Source: 511_sfbay · ID 511.org/1571213 First seen Oct 31, 2026 10:15 AM