Colorado River water deal is reached

The federal government Thursday ushered in a new era of shortage on the Colorado River, adopting a blueprint for how it will tighten the spigot on the West's most important water source.

The guidelines, more than two years in the making, come in the eighth year of the worst drought in the century-long historic record of the Colorado River, which supplies water to 25 million people and 1 million acres of farmland.

Federal water managers say a shortage could be declared as early as 2010, allowing the Department of the Interior to reduce water deliveries to Arizona and Nevada, two of the seven states that have sparred over the waterway for decades. California, which has the biggest water allocation and senior rights in the lower basin, would not be affected.

The drought has left Lake Powell and Lake Mead, the river's two mammoth reservoirs, half-empty, their receding shorelines marked by a wide band of bleached rocks that a decade ago were under water. Without some wet years, Lake Mead may never refill, federal hydrologists say.

"We have had good news and bad news," Interior Secretary Dirk Kempthorne said in a speech before signing the document at the Colorado River Water Users Assn. meeting at Caesars Palace. The bad news, he said, is that the drought shows "no sign of ending."

Scientists also predict that climate change will worsen Western drought patterns and reduce Colorado River flows by increasing evaporation and decreasing snowfall. One study released this year warned that global warming could thrust the Southwest into a state of permanent drought by 2050.

"Runoff in five of the seven Colorado River basin states is projected to decline by more than 15% during the 21st century," Kempthorne said.

Against that backdrop, the basin states of Wyoming, Utah, Colorado, Nevada, New Mexico, Arizona and California began negotiations in 2005 on a blueprint for water shortages.

Their plans formed the basis of the document signed by Kempthorne, who called it "an agreement to share adversity" and a landmark in the tangled history of Colorado River management.

More from the Los Angeles Times