Repairs to a large sinkhole in Milpitas closed all westbound lanes on Montague Expressway on Saturday and most of Sunday, but the roadway reopened Sunday evening, Santa Clara County officials said.
The sinkhole, which collapsed the roadway about 5 p.m. Friday, measured an estimated 30 feet by 30 feet and was 20 feet deep, county officials said. A damaged storm drainpipe is believed to be the culprit.
Two westbound lanes, between Trade Zone Boulevard and the railroad tracks, were initially closed Friday evening.
Initially, the roads department estimated the westbound lanes would reopen as early as Monday evening, weather permitting. But the repairs were completed by Sunday evening and would be clear for the Monday morning commute.
"The possible cause of the sinkhole is due to damage to a storm drain pipe that is underneath the roadway and goes across the expressway," said Harry Freitas, director of the county's roads and airports department.
Repairing the roadway included digging out the area, stabilizing the soil underneath, adding rocks and material to build up the hole to the surface, and paving the surface of the roadway, county officials said.