Colorado River drought may force painful reckoning for states
The Colorado River drought — nearly unrivaled in 1,250 years — is, many experts fear, the harbinger of a new, drier era in which the Colorado’s flow will be substantially and permanently diminished. The effects would be widespread, and could include rationing for big cities as well
The New York Times
LAKE MEAD, Nev. — The sinuous Colorado River and its slew of man-made reservoirs from the Rockies to southern Arizona are being sapped by 14 years of drought nearly unrivaled in 1,250 years.
The once broad and blue river has in many places dwindled to a murky brown trickle. Reservoirs have shrunk to less than half their capacities, the canyon walls around them ringed with white mineral deposits where water once lapped.
Seeking to stretch their allotments of the river, regional water agencies are recycling sewage effluent, offering rebates to tear up grass lawns and subsidizing less-thirsty appliances from dishwashers to shower heads.
But many experts believe the current drought is only the harbinger of a new, drier era in which the Colorado’s flow will be substantially and permanently diminished.
Faced with the shortage, federal authorities this year will for the first time decrease the amount of water that flows into Lake Mead, the nation’s largest reservoir, from Lake Powell 180 miles upstream.
That will reduce even more the level of Lake Mead, a crucial source of water for cities from Las Vegas to Los Angeles and for millions of acres of farmland.
Reclamation officials say there is a 50-50 chance that by 2015, Lake Mead’s water will be rationed to states downstream. That, too, has never happened before.
“If Lake Mead goes below elevation 1,000” — 1,000 feet above sea level — “we lose any capacity to pump water to serve the municipal needs of 7 in 10 people in the state of Nevada,” said John Entsminger, the senior deputy general manager of the Southern Nevada Water Authority.
Since 2008, Entsminger’s agency has been drilling an $817 million tunnel under Lake Mead — a third attempt to capture more water, as two other higher tunnels have become threatened by the lake’s falling level. In September, faced with the prospect that one of the tunnels could run dry before the third one was completed, the authority took emergency measures: still another tunnel, this one to stretch the life of the most threatened intake until construction of the third one is finished.
These new realities are forcing a profound reassessment of how the 1,450-mile Colorado, the Southwest’s only major river, can continue to slake the thirst of one of the nation’s fastest-growing regions.
Agriculture, from California’s Imperial Valley to Wyoming’s cattle herds, soaks up about three-quarters of its water, and produces 15 percent of the nation’s food. But 40 million people also depend on the river and its tributaries, and their numbers are rising rapidly.
The labyrinthine rules by which the seven states relying on the Colorado share the river’s water are rife with potential points of conflict. And while some states have made huge strides in conserving water — and even reducing the amount they consume — they have yet to chart a united path through shortages that could last years or even decades.
“There is no planning for a continuation of the drought we’ve had,” said one expert on the Colorado’s woes, who asked not to be identified to preserve his relationship with state officials. “There’s always been within the current planning an embedded hope that somehow, things would return to something more like normal.”
Already, the drought is upending many of the assumptions on which water barons relied when they tamed the Colorado in the 1900s.
The Colorado-basin states tried in the 1920s to stave off future fights over water by splitting it, 50-50, between the upper-basin states of Utah, New Mexico, Colorado and Wyoming and the lower-basin states of Arizona, Nevada and California.
In fact, the deal underestimated how much water the fast-growing lower-basin states would need. During most of the wet 20th century, however, the river usually produced more than enough water to offset any shortage.
Now, the gap between need and supply is becoming untenable. Lake Mead currently stands about 1,106 feet above sea level, and is expected to drop 20 feet in 2014.
A continued decline would introduce a new set of problems: At 1,075 feet, rationing begins; at 1,050 feet, a more drastic rationing kicks in, and the uppermost water intake for Las Vegas shuts down. At 1,025 feet, rationing grows more draconian; at 1,000 feet, a second Las Vegas intake runs dry.
The Colorado River’s upper-basin states are worried that they might have to curb their consumption to meet their obligations downstream. But the thorniest problems are in the lower basin, where a thicket of political and legal deals has left Arizona holding the bag should the Colorado River continue to diminish.
In the 1960s, California’s legislators demanded first dibs on lower-basin water as a condition of supporting federal legislation to build the Central Arizona Project, a vast web of canals irrigating that state’s farms and cities.
Should rationing begin in 2015, Arizona would sacrifice a comparatively small fraction of its Colorado River allotment, while California’s supply would remain intact.
Painful as that would be, though, it could get worse: Should Lake Mead continue to fall, Arizona would lose more than half of its Colorado River water before California lost so much as a drop.
That would have a cascading effect. The Central Arizona Project would lose revenue it gets from selling water, which would raise the price of water to remaining customers, leading farmers to return to pumping groundwater for irrigation — exactly what the Central Arizona Project was supposed to prevent.
“By going back to the pumps, you’ll have made the decision that agriculture will no longer be an industry in central Arizona,” David Modeer, the project’s general manager, said in an interview.
Even Californians doubt Arizona would stand for that, but no successor to the 1960s agreement is in place. And California has a vital interest in holding onto its full allotment of water.
The Southern California region using Colorado River water is expected to add 6 million people to the existing 19 million in the next 45 years, and their other water source — the Sierra Nevada to the north — is suffering the same drought and climate problems as the Colorado River basin.
“The basic blueprint of our plan calls for a reliable foundation that we then build upon, and that reliable foundation is the Colorado River and Northern California water,” said Jeffrey Kightlinger, the general manager of the Metropolitan Water District of Southern California.
“To the extent we lose one of those supplies, I don’t know that there is enough technology and new supplies to replace them.”