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: $4

COLLECTION: One-way, westbound in Newark

TRAFFIC LANES: Three in each direction

FY 2007-08 TOTAL TOLL-PAID VEHICLES: 9,193,831

FY 2007-08 TOTAL BASE TOLLS COLLECTED: $10,013,449

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. There is currently a bill (AB 1175) in the California Legislature to add the Dumbarton Bridge to the Toll Bridge Seismic Retrofit Program.

See also: Bayfront Expressway Widening

See also: Caltrans' toll bridge page