The Dumbarton Bridge is open this morning after a weekend of seismic retrofit work. Caltrans reopened the span at 7:19 p.m. Monday, nearly 10 hours ahead of the 5 a.m. Tuesday target.

All six lanes of the bridge were closed since 10 p.m. Friday for seismic retrofit work.

"Everything just went really smoothly," said Dumbarton Bridge spokeswoman Effie Milionis Verducci.

Work crews were installing 96 seismic bearings under the bridge deck to enable it to remain flexible and resilient during strong ground motion.

The contractor was Shimmick Construction Co., based in Oakland.

Nearly 61,000 vehicles per day use the 1.6-mile-long bridge to travel between Fremont and Menlo Park.