FREMONT -- Crews have begun installing 32 steel plates on the Dumbarton Bridge as part of an ongoing $149 million retrofit project that will continue to cause evening and overnight lane closures.

Workers on Thursday began placing the steel plates along the pavement to allow for the delivery of other materials needed to complete the retrofit project.

Drivers will be able to traverse the plates, which will remain in place through the completion of the retrofit project in fall 2012.

The speed limit on the bridge between Fremont and Menlo Park will remain at 65 mph.

The 1.6-mile span, which was rebuilt in 1982, serves about 61,000 vehicles per day.

The retrofit project involves reinforcing existing concrete, installing bearings and replacing major deck joints.

On weeknights, two of the three westbound lanes will be closed as early as 7 p.m. and reopen by 5 a.m.

Two of the three eastbound lanes also may be closed as early as 8 p.m. and reopen by 6 a.m. the next day.

Lane closures are extended on weekends, starting as early as 4 p.m. for westbound traffic and 6 p.m. for eastbound traffic.

Both directions will be reopened by 1 p.m. the following weekend day.

Contact Matthew Artz at 510-353-7002 or martz@bayareanewsgroup.com. For more Fremont news, visit IBAbuzz.com/tricitybeat.