Tag: Colorado River

US declares first-ever Colorado River water shortage – Arizona and Nevada affected

Strange Sounds – August 17, 2021

For the first time ever, the US federal government has declared a water shortage on the Colorado River.

That’s because Lake Mead, the nation’s largest reservoir, is lower than it’s ever been. It provides water to 25 million people across Arizona, Nevada, California, and Mexico, but as of Monday it’s at just 1,067 feet above sea level – about 35% full.

The federal water-shortage declaration means that Arizona and Nevada will face mandatory water cut-backs in January. The cuts will mostly affect farmers in Arizona; the state will lose about one-fifth of the water it normally gets from the river.

“It’s very significant,” explains Brad Udall, senior water and climate scientist at Colorado State University. “It’s something that those of us in the climate community have been worried about for over a decade, based on declining flows and increasing droughts.”

Drought Monitor, which tracks such conditions across the country. Last week, 26.5% of the country was in “extreme” or “exceptional” drought.

Such droughts will probably become more common and more intense as global temperatures continue to rise in the coming decades. Rising temperatures will also reduce the snowpack that would normally replenish the Colorado River every year. That could lead to more severe water cutbacks.

https://strangesounds.org

US West prepares for possible 1st water shortage declaration

Sam Metz – April 19, 2021

CARSON CITY, Nev. (AP) — The man-made lakes that store water supplying millions of people in the U.S. West and Mexico are projected to shrink to historic lows in the coming months, dropping to levels that could trigger the federal government’s first-ever official shortage declaration and prompt cuts in Arizona and Nevada.

The U.S. Bureau of Reclamation released 24-month projections this week forecasting that less Colorado River water will cascade down from the Rocky Mountains through Lake Powell and Lake Mead and into the arid deserts of the U.S. Southwest and the Gulf of California. Water levels in the two lakes are expected to plummet low enough for the agency to declare an official shortage for the first time, threatening the supply of Colorado River water that growing cities and farms rely on.

It comes as climate change means less snowpack flows into the river and its tributaries, and hotter temperatures parch soil and cause more river water to evaporate as it streams through the drought-plagued American West.

The agency’s models project Lake Mead will fall below 1,075 feet (328 meters) for the first time in June 2021. That’s the level that prompts a shortage declaration under agreements negotiated by seven states that rely on Colorado River water: Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming.

The April projections, however, will not have binding impact. Federal officials regularly issue long-term projections but use those released each August to make decisions about how to allocate river water. If projections don’t improve by then, the Bureau of Reclamation will declare a Level 1 shortage condition. The cuts would be implemented in January.

https://www.sfgate.com