For years now, Lake Mead's so-called "bathtub ring" has been a sign of less water flowing into the reservoir. Arizona, California, Nevada and Mexico rely on Lake Mead for their allotments from the Colorado River.
If a shortage is declared, federal guidelines dictate that Arizona take the biggest reductions in the lower basin. University of Arizona Professor George Frisvold explains the immediate challenges a shortage would create for Arizona's agricultural communities.
Arizona 360 airs Fridays at 8:30 p.m. on PBS 6 and Saturdays at 8 p.m. on PBS 6 PLUS. See more from Arizona 360.
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