The latest numbers show the resort has already received at least 7 feet of new snow within the last three days and more is expected.
U.S. Route 395, the only way to get to Mammoth Mountain from the Los Angeles area, was shut down. Caltrans was working to get the highway reopened.
Officials were expecting a busy weekend at Mammoth Mountain and urged skiers to plan ahead, check road conditions and see what's currently open.
Big rig overturns, hangs off LA freeway amid storm