Historic snowfall across the Rocky Mountains is helping recharge some of the country’s biggest reservoirs and provide – briefly – some much-needed breathing room for the oversubscribed Colorado River.
Forecasts say the melting snow flowing into Lake Powell via the Colorado River and its tributaries could hit 177% of average this year, a major boost at a time when lake levels had hit historic lows.
An extra pulse of water has been sent through the Grand Canyon this week. The Bureau of Reclamation is running a “high-flow experiment” at Glen Canyon Dam in northern Arizona, which means a big release of water designed to move and redeposit sand and sediment will make its way downstream from the dam. This experiment is the first since 2018, and comes in response to forecasts for an above average spring snowmelt in the Rocky Mountains.
A large release of water from Lake Powell began Monday morning. It’s water that will eventually end up in Lake Mead near Las Vegas after a two-day journey through the Grand Canyon where it will help restore sandbars and beaches while moving sediment downriver.
The Bureau of Reclamation released its 24-Month Study on Thursday, April 20, which includes an increase to downstream flows from Lake Powell to Lake Mead of up to 9.5 million acre-feet (maf) this water year, which runs from (October 1, 2022 through September 30, 2023.
According to a press release from the Bureau of Reclamation, Glen Canyon Dam’s annual release volume for water year 2023 was initially set at 7.0 maf, based on the August 2022 24-Month Study, and is now projected to increase to up to 9.5 maf because of high snowpack this winter and projected runoff in the Colorado River Basin this spring.
The San Diego County Water Authority said a new federal report that forecasts significant increases in reservoir levels along the Colorado River is “welcome news” for San Diego’s water supply.
The report released Thursday by the U.S. Bureau of Reclamation forecasts that a near-record snowpack will raise Lake Mead at Hoover Dam by over 20 feet and Lake Powell farther north by 50 feet.
About two-thirds of San Diego County’s supplies are conserved Colorado River water.
Dan Denham, the Water Authority’s deputy general manager, said the federal report “is definitely welcome news and will buy us time to make crucial decisions.”
A federal report released April 20 says near-record snowpack in the Colorado River Basin could raise the elevation of Lake Mead by more than 20 feet by the end of the year, providing a critical opportunity for water agencies to improve long-term management of the river.
The U.S. Bureau of Reclamation’s report shows vastly improved hydrological conditions are also expected to raise the water level in Lake Powell by more than 50 feet. California relies heavily on lakes Powell and Mead for water, as do Arizona and Nevada.
Despite the good news this year, the ongoing trend toward a hotter and drier climate means long-term solutions remain critical. About two-thirds of San Diego County’s supplies are conserved Colorado River water.
What a difference a month makes.
The March 24-month forecast, which predicts reservoir levels along the Colorado River for the next two years, had Lake Mead on a steady trajectory downward.
After years of punishing drought, a historic winter snowpack is bringing a reprieve to the Colorado River Basin and the nation’s largest reservoirs.
The US Bureau of Reclamation announced Thursday that this winter’s rain and the projected runoff from above-normal snowfall is expected to boost its water releases this year from Lake Powell to Lake Mead by 2.5 million acre-feet.
A federal report released April 20 says near-record snowpack in the Colorado River Basin could raise the elevation of Lake Mead by more than 20 feet by the end of the year, providing a critical opportunity for water agencies to improve long-term management of the river.
The U.S. Bureau of Reclamation’s report shows vastly improved hydrological conditions are also expected to raise the water level in Lake Powell by more than 50 feet. California relies heavily on lakes Powell and Mead for water, as do Arizona and Nevada.
Despite the good news this year, the ongoing trend toward a hotter and drier climate means long-term solutions remain critical. About two-thirds of San Diego County’s supplies are conserved Colorado River water.
The San Diego County Water Authority supports a consensus-based approach for long-term solutions that uphold California’s high-priority water rights on the Colorado River.
“The report is definitely welcome news and will buy us time to make crucial decisions,” said Dan Denham, the Water Authority’s deputy general manager. “It’s critical that everyone with a stake in the river – including the Bureau of Reclamation, basin states, tribes and Mexico – continue to develop real and lasting solutions for the river’s long-term operation.”
In its annual “24-Month Study,” Reclamation addresses changing conditions on the Colorado River and forecasts operations for the river system’s reservoirs for the following two years. Today’s report projects the above-average snowpack will help recharge the Colorado River. Up to 9.5 million acre-feet of water is expected to be released this year from Glen Canyon Dam into Lake Mead, an increase of 2.5 million acre-feet. That water could increase Lake Mead’s water level by more than 20 feet and break years of declines in the reservoir’s levels. Actual water releases into Lake Mead will be adjusted based on the observed inflow in Lake Powell.
The study follows Reclamation’s April 11 release of a draft Supplemental Environmental Impact Statement that considers changes to near-term operations on the Colorado River, including potential reductions in water supplies for California and across the Lower Colorado River Basin. The draft analyzes two alternatives, plus a no-action alternative.
“Despite this year’s welcomed snow, the Colorado River system remains at risk from the ongoing impacts of the climate crisis,” said Commissioner Camille Calimlim Touton.
— Bureau of Reclamation (@usbr) April 20, 2023
The Water Authority continues to collaborate with its partners on the Colorado River Board of California to ensure the state’s high-priority water rights on the river are upheld through the environmental review process.
“We are hopeful that Reclamation’s flow projections will materialize as expected,” Denham said. “At the same time, the Colorado River remains mired in decades of hot, dry weather that requires new thinking about water use and conservation across the Basin. As we work collaboratively to find consensus-based, long-term solutions that serve all water users, we will continue to advocate that any future actions uphold the Law of the River and California’s senior rights.”
Despite a wet winter, California and other western states will still need to cut back how much water they draw from the Colorado River. The question federal and state officials are weighing is: How much will they each need to cut?
The Water News Network is San Diego County’s source for water news and information.
