Record low waters in Nevada's Lake Mead

Drought in the southwestern U.S. will deplete the vast Lake Mead this week to levels not seen since Hoover Dam was completed and the reservoir on the Colorado River was filled in the 1930s, federal water managers said Tuesday.

The projected lake level of about 1,080 feet will be below the 1,082 feet recorded in November 2010 and the 1,083-foot mark measured in April 1956 during another sustained drought.

But U.S. Bureau of Reclamation regional chief Terry Fulp said water obligations will be met at least through next year without a key shortage declaration. The result will be full deliveries to cities, states, farms and Indian tribes in an area that's home to some 40 million people and the cities of Las Vegas, Phoenix and Los Angeles.

"We continue to closely monitor the projections of declining lake levels and are working with stakeholders throughout the Lower Basin to keep as much water in Lake Mead as we can through various storage and conservation efforts," Fulp said in a statement.

The lake on Tuesday was just under 1,082 feet above sea level, and the reservoir was about 39 percent full, said Rose Davis, a bureau spokeswoman in Boulder City, Nevada.

The reservoir was last full in 1998, at just under 1,296 feet above sea level. Davis said the bureau expects a slight increase in water level to about 1,083 feet by Jan. 1, 2015.

"We projected this was coming," Davis said. "We are basically where we expected to be, given the dry winters in 2012 and 2013."

Las Vegas, with more than 2 million residents and some 40 million tourists a year, is almost completely dependent on Lake Mead for drinking water.

Federal and state water officials have negotiated plans for a shortage declaration triggering delivery cuts to Nevada and Arizona if annual projections for the Lake Mead water level drop below a 1,075 foot elevation. That projection is based on data being compiled by the Bureau of Reclamation.

Davis said the 1,075-foot trigger point is not expected this year or next. But last year, after back-to-back driest years in a century, federal water managers gave Arizona and Nevada a 50-50 chance of having water deliveries cut in 2016.

California, Colorado, Utah, New Mexico and Wyoming wouldn't see direct cuts in their share of river water, but officials have acknowledged there would be ripple effects.

The Associated Press