An “atmospheric river” that brought significant rain to California this week has delivered a motherload of snowfall to the ski resorts.

Mammoth Mountain reported 11-inches of fresh snow over 24 hours Wednesday and 37” over the past several days. Mammoth’s base depth ranges from 85” at the main lodge to 165” at the summit – the deepest snow among the nation’s major ski resorts, according to

Alta Ski Area, outside of Salt Lake City, Utah, reported a base of 90” Wednesday afternoon after receiving 15 inches of fresh powder.

Tiny Appalachian Ski Mountain in North Carolina had snow depths ranging from 94-124″.

“That could be just the beginning, with snow in the forecast every day into mid-January and some models calling for up to 25” of water over the next several weeks,” Mammoth Mountain said. “General rule of thumb is ten inches of snow to every inch of water.”

Also in California, Ski China Peak received a colossal 28” of fresh powder Monday and Tuesday.

Other California Ski Resort Snow Reports: (12/28):

Bear Mountain = 24-36” Base

Boreal Mountain Resort = 75” Base

Heavenly = 20-55” Base

Kirkwood = 64” Base

Mountain High = 20-30” Base

Northstar California = 23-52” Base

Snow Valley = 18-36” Base

Tap here for more California ski resorts and updated reports from