California Highway Patrol officials said the two right lanes of westbound Interstate Highway 580 near Livermore reopened at 10 p.m. tonight after a large pothole developed in the highway.
CHP officials reported the closure at 5 a.m. east of Greenville Road.
Caltrans spokesman Marcus Wagner said the pothole resulted from the rain and the old age of the roadway.
Crews started repairing the 4-by-12-foot pothole this morning and expected to have it repaired by about 4 p.m., but that has since been revised to 9 p.m.
Wagner also said Caltrans crews are in the process of repaving Highway 580 from the Greenville Road exit to the Alameda County line with San Joaquin County.