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April 12, 2011 > Steel road plates to be installed on Dumbarton Bridge

Steel road plates to be installed on Dumbarton Bridge

Submitted By Bart Ney

The next phase of the Dumbarton Bridge's seismic retrofit began on April 7. Thirty-two steel plates will be installed on west- and eastbound lanes during nighttime lane closures. Motorists will drive over raised plates; steel tapers will transition traffic over them.

The plates will grant workers access, as well as delivery of materials, inside the bridge to complete seismic retrofit work. The plates are approximately 9 feet by 10 feet, and 1.5-inches-thick and will remain in place for the retrofit project's duration which is scheduled for completion by fall 2012. The 65 mph-speed limit will not change.

Weeknights, there will be westbound closures of lanes 1 and 2 or lanes 2 and 3 beginning as early as 7 p.m. All westbound lanes will re-open by 5:00 a.m. the following day. Eastbound lanes 2 and 3 may be closed overnight and may begin as early as 8 p.m. All eastbound lanes will re- open by 6 a.m. the next day.

During the weekend there are extended hours of lane closures from as early as 4 p.m. for westbound traffic and 6 p.m. for eastbound - both directions will be re-opened by 1 p.m. the following day.

Seismic retrofit of he Dumbarton Bridge, part of the Toll Bridge Program, includes reinforcing the existing concrete slab bridge, replacing major deck joints and installing isolation bearings. The retrofit is contracted to Shimmick Construction Co., Inc. (SCCI), Oakland.

The 1.6-mile-long bridge serves approximately 61,000 vehicles per day and has three lanes of traffic in each direction. The five main components of the bridge include: a Main Channel crossing at the middle of the bridge, an Approach Structure at each end of the main crossing, and a Trestle Structure at the end of each Approach Structure. The existing structure opened in 1982, replacing the 1927 Dumbarton Bridge. The bridge connects the cities of Menlo Park (San Mateo County) and Fremont (Alameda County).

For daily updates of lane closures, visiting

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