April 24, 2018
A 2013 photo shows the "bathtub ring," a high water mark on Lake Mead near Boulder City, Nevada. Tension among U.S. states that rely on the Colorado River escalated into a public feud when an Arizona water provider was accused of manipulating the level of Lake Mead amid a prolonged drought. (AP Photo/Julie Jacobson, File)
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Tension over the drought-stressed Colorado River escalated into a public feud when four U.S. states accused Arizona’s largest water provider of manipulating supply and demand, potentially threatening millions of people in the United States and Mexico who rely on the river.