OPINION: California’s Water System Must Be Prepared for Climate Change

California’s water system, constructed in partnership with the federal government, was built on a predictable weather cycle every calendar year. Throughout the winter, snow piles in the Sierra before it melts in late spring and flows throughout the state just when farms need it most. For decades, this cycle, paired with our world-class water infrastructure, allowed for reliable water deliveries, captured excess flows in reservoirs and efficiently moved supply to refill our groundwater tables. But that rhythm is slowly changing. State climate indicators show the Sacramento River’s peak runoff now arrives nearly a month earlier — in March instead of April — compared with the mid-20th-century record. Looking ahead, the Department of Water Resources projects the Sierra’s April 1st snowpack will shrink by roughly half to two-thirds before the end of the century.