Since the start of the storm Friday, the lake has risen 20 feet, according to data from the California Department of Water Resources.The lake saw its greatest gains about 4 p.m. Sunday when flows into the lake peaked at 30,000 cubic-feet-per-second. Since then, flows have been decreasing.On Sunday alone, the lake rose 10 feet.

Over the four-day period, the lake added roughly 84,000 acre-feet of water, nearly a quarter of the lake’s current content.

This weekend’s storm brought much-needed rain to the drought-stricken area, but experts say it will take much more before the region can close the deficit left by months of abnormally dry weather.