Low River Levels Make Water Shortage Threat Very Real

San Diego's two largest water sources -- the Colorado River and the Sierra Nevada snowpack -- are at historic low levels. The Colorado River is in its 8th year of drought, so the state has relied heavily on the Sierra snowpack. But this year, the Sierra snow pack contains 40 percent of its typical water content. Although many experts believe the state has enough water for this year, if next winter is as dry as this one, water shortages are probable.

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• Rob Davis , voiceofsandiego.org.