The record snowpack is expected to put 14.5 million acre-feet of water into the upper Colorado River, raising the drought-depleted Lake Powell by at least 50 feet.
on Monday opened the gates at Glen Canyon Dam allowing up to 39,500 cubic feet per second, or cfs, to pour into the river channel at Lees Ferry, sending a flood-stage surge of water through Grand Canyon. That’s like the contents of 27 Olympic swimming pools a minute spouting through the bottom of the dam.
Under a plan approved in 2012, the bureau had been conducting high-flow experiments almost annually until 2018. Since then, a string of dry years and excessive water use have depressed levels of Lake Powell, which today is onlyThat is about to change drastically in the coming weeks as the upper Colorado basin’s snowpacks, which are 157% of normal, melt and flow into Powell and upstream reservoirs. Thethis year, according to Bart Leeflang, the CRAU’s hydrologist.
“A couple years ago, we were bemoaning the fact that we had lost 2 million acre-feet from April to May [from Lake Powell],” Leeflang said. “And now you see that we picked up 2 million acre-feet in two weeks in March.” This year, the Bureau plans to increase releases from Glen Canyon Dam to 9.5 acre-feet to bring up the level of Powell’s downstream big sister, Lake Mead. That’s the maximum amount released under the dam’s operating guidelines and 2 million more than what is typically released in a year.expected to total 13.2 million acre-feet“The 2023 water year was an exceptional hydrological period for the Colorado River basin.
Under normal operations this April, dam releases would fluctuate between 8,033 and 14,631, depending on the time of day, according to the Bureau. This week’s high-flow experiment is the sixth since the agency started them in 2012.
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