(KRON) -- The southbound lanes of U.S. Highway 101 in Santa Clara County were closed Thursday morning after a gas spill caused by an overturned big rig, according to Caltrans. Maintenance crews shut down the roadway just before 5:30 a.m. after the crash spilled an estimated 600 to 700 gallons of ga soline onto the wet pavement. Hazmat teams are on scene working to contain and clean up the spill. Bay Area storm updates: Tens of thousands without power Southbound traffic is being diverted at Yerba Buena Road. Caltrans said traffic impact is minimal because of light Christmas Day travel. The agency estimates the highway will reopen between 4 p.m. and 5 p.m. ...read more read less