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.
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.
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|
|Collection:||One-way, westbound in Newark|
|Traffic Lanes:||Three in each direction|
|FY 2020-21 Total Toll-Paid Vehicles:||7,463,706|
|FY 2020-21 Total Tolls Collected:||$58,735,604|
|Bridge Path Counter Data:||Access bicycle and pedestrian counter data|