California water levels have been greatly improved by the atmospheric river.

http://www.eastbaytimes.com/2017/01/09/california-storms-fill-drought-parched-reservoirs/

Shasta has a capacity of 4.55 million acre-feet of water an acre is roughly 44000 sq. feet,  and acre foot of water is an acre of water down a foot.... a foot deep of water in the area of an acre,  44,000 cu ft. of water roughly, ea cubic ft of water is ~7 gallons

So that reservoir full can hold 308,000gal  X 4,550,000af= 1.401 trillion gals of water.  Weighing in at a cool 19.619 trillion lbs. =  9.809 billion tons....California prunes need a lot of water...