“This is as much an extreme weather event as Sandy was on the East Coast,” she said, referring to the deadly and destructive storm that hit the United States in fall 2012. “Does a drought not rise to the same level as a storm? The potential damage is just as bad.”
Mulroy’s comments come as the Colorado wraps up another disappointing water year and approaches another grim milestone: By the end of August, the total amount of water stored on the river is expected to reach its lowest point since Glen Canyon Dam was finished and Lake Powell began to fill in 1966.
In the coming days, federal regulators are expected to announce plans to slash the annual release of water from Powell, a move that will accelerate the decline of Lake Mead.
The reservoir east of Las Vegas is now expected to shrink almost 25 feet over the next year to a record low, with Lake Powell not far behind. By fall 2014, the surface of Lake Mead could drop to 1,075 feet above sea level, triggering the first federal shortage declaration on the river and prompting water supply cuts for Nevada and Arizona.
At this point, Mulroy said, it will take “a major, Noah’s Ark-type event in the next week” to change the upcoming announcement by the U.S. Bureau of Reclamation, which oversees the coordinated operation of the two reservoirs. “I’m very worried. I’m expecting the worst,” she said…
Under normal conditions, Lake Powell releases at least 8.23 million acre-feet of water a year downstream to Lake Mead for use by Nevada, Arizona, California and Mexico. This year’s release is almost sure to be cut to 7.48 million acre-feet to slow the decline of the upstream reservoir.
“This is the first time ever that has happened,” Mulroy said…
The Las Vegas Valley depends on the river for 90 percent of its drinking water supply. That water is drawn from Lake Mead using two intake pipes that could stop working if the reservoir drops far enough.
The surface of Lake Mead already has fallen more than 100 feet since the current drought descended on the Colorado River in 2000.
But even in an average year, the river does not carry enough water to fill the allocations parceled out decades ago to the seven states and Mexico.
The expected cut to Lake Powell’s release for the coming year creates a 1.5 million acre-foot math problem for Mead, which is supposed to deliver 9 million acre-feet of water each year to Nevada, Arizona, California and Mexico.
The dire situation is forcing Mulroy and other water managers along the river to consider entirely new strategies to protect lake levels and squeeze more water out of the stricken river.
One short-term option is to pay farms in Arizona and California to temporarily fallow fields and use water that would normally go for irrigation to prop up Lake Mead.
Already, California, Nevada and Mexico are banking as much unused water as they can in Mead, adding about 10 vertical feet to the reservoir so far that wouldn’t otherwise be there…
Almost anything they do will require money, and that’s where the federal government can lend a hand, Mulroy said. After all, the Colorado supplies water to more than 30 million people across a region that produces roughly a quarter of the nation’s gross domestic product, she said. “This isn’t just a Las Vegas problem.”[…]
Meanwhile, the authority is rushing to complete a new third intake capable of drawing water from one of the deepest parts of the lake. Mulroy said she expects the $817 million project to be finished and online by the end of 2014 — because it has to be. If conditions on the river worsen, Intake No. 1 could be out of commission by spring of 2015…
One thing is clear, Mulroy said: It will take the creativity, cooperation and shared sacrifice of all Colorado River water users to make it through this crisis. All the old divisions must be set aside.
“You can’t go to court. You don’t have time to go to court. You’ll be sucking air (through your intakes) before that gets done,” she said. “Now is not the time to rattle sabers. It’s a time to roll up your sleeves and work as collaboratively as you can.”