#LakePowell Reached Capacity 40 Years Ago. But What Do The Coming Decades Hold In Store? — KQER #ColoradoRiver #COriver #aridification

Lake Powell. Photo credit: The National Park Service

From KUER (Lexi Perry):

The water has made development possible and is used for farms, homes and businesses. Meanwhile, recreation has risen to over 4 million annual visitors in Glen Canyon National Recreation Area, with tourists bringing in over $420 million to local communities.

But climate scientists studying the Colorado River find the lake’s water source is quickly declining…

According to Brad Udall, a water and climate researcher at Colorado State University, the lake is crucial for honoring the commitments laid out in that Colorado River Compact.

“Lake Powell is what the upper basin considers its bank account for meeting required deliveries to the three lower basin states. So, it’s essential to the management of the river,” Udall said.

When Lake Powell reached capacity on June 22, 1980, it was a wetter period of time for the region. Today, the lake is just above half full, and a large part of that is because of climate change.

“Since the year 2000, the flow of the river is roughly down 20% and about half of that decline is due to higher temperatures,” Udall said.

And as states continue to use the water, lower flows mean there is less to store in Lake Powell and Lake Mead.

Even though extreme dry and wet years have fluctuated, the West is generally getting drier, said John Fleck, the director of water resources at the University of New Mexico.

“We really need to call [what we’re experiencing] aridification — the drying out of the Colorado River Basin because of climate change, we can’t just call it ‘drought’ anymore,” Fleck said. “It appears to be this permanent phenomenon that’s lowering the lake levels. You should not expect it to return to high lake levels over long periods of time. That’s just not something we can expect to happen.”

While the river flow has declined, the demand for water has increased with regional growth. Upper and lower basin states are making drought contingency plans to keep Lake Powell and Lake Mead from reaching critically low levels.

Udall said states will also have to rethink those original water allocations from the 1920s.

“It’s hard to balance the equities of trying to respect these agreements that people have planned on versus changing circumstances that make these agreements totally inappropriate for right now. And I don’t know what the answer is but something’s gotta give.”

[…]

Lexi Peery is a Report for America corps member who reports from KUER’s Southwest Bureau in St. George. Follow Lexi on Twitter @LexiFP

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