The Sierra snowpack has reached its seasonal peak. The snowpack plays an important role in providing water to millions of Californians. Throughout the winter months, snow accumulates on the high peaks of the Sierra Nevada and slowly melts in the spring and early summer. The runoff fills dozens of major reservoirs downstream. Last year’s epic snowpack helped relieve a yearslong drought, reaching an eye-popping 252% of normal on April 8. By that date, the mountains held an average equivalent of 64.2 inches of water. The current snowpack now holds a healthy 27.3 inches of water on average after a series of winter storms alleviated concerns that California was facing a “snow drought.” The California Department of Water Resources tracks the snow water equivalent in the Sierra using a network of 130 electronic sensors. …This graphic plots a 20-year history of the Sierra snowpack, showing wet years interspersed with severe droughts.