The Central Arizona Project - this section is in Avra Valley - carries Colorado River water from Lake Mead toward Tucson. Officials say there is a 35 percent chance of the first CAP water shortage in history in 2016.
Another year of very low precipitation and snowpack in the Rocky Mountains has spurred another year of low runoff on the Colorado River - the 10th such year out of the past 14.
One of the potential solutions to drought in the Colorado River basin - a major test of desalination - was an environmental and economic success, UA researchers and U.S. officials said this week.
Sonoran Institute staff member Bernabe Rico Hurtado downloads data from instruments that record the water level and quality at the Cienega de Santa Clara in northern Sonora in this undated photograph.
The Colorado River, volatile as ever, is expected to run far below normal this year in Arizona following a near-record high 2011 runoff, authorities said Wednesday.