California Drought Warnings

January through May 2013 were California’s driest in about 90 years of record keeping.

Currently the San Luis Reservoir, which gets water from the Sacramento-San Joaquin River Delta, is only 22 percent of its historical average for this time of year.

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California’s other main source of water comes via the Colorado River Basin, originating in the Rocky Mountains. More than a decade of drought has left both Lake Powell and Lake Mead less than half full. About a quarter of urban Southern California depends on these reservoirs for supply.

Climate Progress