Lake Mead Hits Lowest Level Since Filling 75 Years Ago - NYT

[hatrack]

Sometime between 11 and noon on Sunday, the water level in Lake Mead, the massive reservoir whose water fills the taps of millions of people across the Southwest, fell lower than it ever has since it was filled 75 years ago.

Even as a flurry of thunderstorms dropped rain on the Las Vegas area, with as much as an inch falling in the mountains to the north, Lake Mead’s level dropped to 1,083.18 feet above sea level just before noon, and fell further, to 1,083.09, by 9 local time Monday morning. (The Bureau of Reclamation site features a bar graph showing the reservoir levels since the lake was first formed when the Colorado River waters were impounded by Hoover Dam.)

“It is a record-setting moment,” said Colleen Dwyer, a spokeswoman for the Bureau of Reclamation. She added that slightly more water than usual had been released through Hoover Dam over the weekend because the power marketing agency that sends dam-generated electricity around the Southwest had requested some additional flow.

Lake Mead’s levels are still eight feet above the level at which a shortage is officially declared and limited rationing could go into effect for users in Nevada and Arizona, and well above the levels when the Hoover Dam’s hydroelectric output might be seriously jeopardized. But Barry Nelson, a senior policy analyst for the Natural Resources Defense Council, said: “This strikes me as such an amazing moment. It’s three-quarters of a century since they filled it. And at the three-quarter-century mark, the world has changed.”

EDIT

http://green.blogs.nytimes.com/2010/10/18/lake-mead-hits-record-low-level/?partner=rss&emc=rss

[Gman]

1. The current La Nina is forecast to be strong by January

and if it acts like previous La Ninas it will bring a lot of winter precipitation to the mountain states. By spring the trend should turn around. If not, there's some serious climate stuff, serious enough to offset a strong La Nina affecting Lake Mead.

[A HERETIC I AM]

2. Lake Powell was down 150 feet from full pool within the last 5 years

It is now 66' below full pool, or at 63% of capacity.

http://lakepowell.water-data.com/

Keep in mind that Lake Powell is upstream on the Colorado from Lake Mead. All the water that flows through the Grand Canyon and into Lake Mead is released from Lake Powell.