The original Dumbarton Bridge was the first vehicular crossing over San Francisco Bay proper. It 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 BATA's RM 1 program. Widening of the expressway was completed two months ahead of schedule in July 2003.
Caltrans and BATA evaluated the seismic safety of the bridge and determined it requires seismic retrofit work to make the bridge safe during a major earthquake. A seismic retrofit project was completed in January, 2013.
|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 2018-19 TOTAL TOLL-PAID VEHICLES:||12,004,287|
|FY 2018-19 TOTAL TOLLS COLLECTED:||$62,402,620|