Update

Dumbarton Bridge

The original Dumbarton Bridge was the first vehicular crossing over San Francisco Bay proper. It now provides three lanes in each direction, as well as a bicycle/pedestrian path.

The original Dumbarton Bridge was the first vehicular crossing over San Francisco Bay proper. It is also known as State Route 84, located between San Mateo and Alameda counties near Newark and East Palo Alto.

The bridge was rebuilt in 1984 for safety and traffic congestion reasons. The Dumbarton now provides three lanes in each direction, separated by a concrete barrier, as well as a bicycle/pedestrian path.

The western approach to the Dumbarton Bridge from U.S. 101 — the Bayfront Expressway — was widened from four lanes to six lanes as part of the Bay Area Toll Authority (BATA)'s Regional Measure 1 program. Widening of the expressway was completed two months ahead of schedule in July 2003.

Bikes & Pedestrians

How many bikes and pedestrians have crossed the Dumbarton Bridge since April 2016? What times of day do most bikes and pedestrians make the trip?

See the data.
A cyclist on the Dumbarton Bridge path.
Seismic Safety

After Caltrans and BATA evaluated the seismic safety of the Dumbarton Bridge, a 2013 seismic retrofit project was done to make the bridge safer during a major earthquake.

Seismic retrofit work on the Dumbarton Bridge
Bridge Tolls

Find information about bridge tolls and more.

Visit 511.org.
A toll plaza at dusk

Bridge Facts At-A-Glance

Location: State Route 84 between San Mateo and Alameda counties near Newark and East Palo Alto
Structure: Steel box girder and pre-stressed concrete approach spans
Length: Total length 1.6 miles
Vertical Clearance: 85 feet
Channel Span: 340 feet
Opened:
  • Original Structure: January 1927 (replaced)
  • New Structure: October 1982
Cost:
  • 1927 structure: $2.25 million
  • 1982 structure: $70 million
Auto Toll: $7
Carpools: $3.50
Collection: One-way, westbound in Newark
Traffic Lanes: Three in each direction
FY 2022-23 Total Toll-Paid Vehicles: 9,617,023
FY 2022-23 Total Tolls Collected: $62,019,204
Bridge Path Counter Data: Access bicycle and pedestrian counter data
Dumbarton Bridge Resilience Study

The Dumbarton Bridge carries more than 81,000 vehicles a day. MTC initiated the Dumbarton Bridge West Approach + Adjacent Communities Resilience Study to address the threat of sea level rise on the western approach.

Learn more.
Monthly Transportation Statistics

See vehicle traffic and public transit ridership numbers from 2019 to the present.

Get the data.
Regional Measure 1

Regional Measure 1, approved by Bay Area voters in 1988, raised tolls on the Bay Area’s seven state-owned toll bridges to fund bridge improvements and parkway construction.