RELATED: ABC30 Live Traffic Tracker
Just after 3:30 Saturday afternoon, Caltrans posted on Twitter announcing the closure.
The California Highway Patrol says drivers can still get to destinations such as China Peak or Shaver Lake through Auberry Road or Tollhouse Grade.
Westbound traffic is being detoured at Tollhouse.
CHP says drivers should expect delays.
Stay with ABC30 for the latest details on this developing story.