Sierra snowpack is already 'wiped out' this year, adding to California drought and fire worries FacebookTwitterEmail The latest snowpack conditions for California on May 11, 2021 provided by the California Cooperative Snow Surveys.California Cooperative Snow Surveys The Sierra Nevada snowpack, a crucial water source for California’s cities and farms, has already dwindled to next to nothing this year, adding to the state’s worsening drought situation. The latest data from the state Department of Water Resources on Tuesday showed California’s snowpack was just 6% of normal for May 11, and 4% of the normal average for April 1. That date is typically when California’s snowpack is the deepest and has the highest snow water equivalent — the depth of water that would result if the snow melted upon falling,