A giant hole opened up on the 10 Freeway in Redlands after a drain collapsed Thursday, forcing the closure of eastbound lanes, the California Department of Transportation said.
Two of three lanes were closed down at Sixth Street by 2:18 p.m., but a full closure is expected if the road continues to erode, Caltrans tweeted.
The on-ramp to the freeway from Pearl Avenue was also closed after the collapse triggered a mudslide that caused part of the 10 Freeway to wash away.
Commuters were encouraged to find alternate routes.
Rain pounded Southern California over the Thanksgiving holiday as a storm swept through the region, prompting multiple road closures and weather watches and advisories.
Caltrans crews responded to the scene to start working on emergency repairs Thursday, but the lanes and on-ramp are expected to stay closed for several days, the department said.