@USBR: #Snowpack benefits #ColoradoRiver operations #COriver #aridification #runoff

A winter wonderland in Winter Park, Colorado, near the west portal of the Moffat Tunnel, which delivers water from the Fraser and Williams Fork River basins, under the Continental Divide and on to the Moffat Treatment Plant in Lakewood, Colorado. Photo credit: Denver Water. (Photo taken in winter of 2016-2017.)

Here’s the release from the Bureau of Reclamation (Pattie Aaron/Marlon Duke):

A monthly study released today by the Bureau of Reclamation indicates this winter’s plentiful snowpack will benefit the Colorado River Basin through increased runoff to crucial reservoirs. With the improved hydrology, Lake Powell’s operation for water year 2019 will shift to a balancing release of up to 9.0 million acre-feet. Snowpack in the upper Colorado River basin is about 130 percent of average, with a forecasted April through July inflow into Lake Powell of 9.20 maf, or 128 percent of average. That above-average inflow projection is due to extremely wet conditions in the basin during February and March. Releases from Lake Powell to Lake Mead are consistent with the 2007 Colorado River Interim Guidelines for Lower Basin Shortages and the Coordinated Operations for Lake Powell and Lake Mead.

“This year’s snowpack is welcome news for the Colorado River Basin,” said Reclamation Commissioner Brenda Burman. “But one good year cannot reverse the effects of nearly two decades of severe drought. Current total Colorado River System storage is approximately 45% of full capacity.”

Commissioner Burman continued, “Recent accomplishments like the drought contingency plans provide an important bridge to minimize risks from ongoing drought and gain valuable operating experience during the remaining period of the 2007 operating guidelines.”

The April 2019 24-Month Study projects Lake Mead’s January 1, 2020 elevation to be 1,084.27 feet, almost 10 feet above the shortage determination trigger of 1,075 feet. The August 2019 24-Month Study projections will be used to determine the operating tiers for Lake Powell and Lake Mead in 2020.

The April 2019 24-Month Study can be accessed at https://www.usbr.gov/lc/region/g4000/24mo.pdf.

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