Who must give up #ColoradoRiver water? As conservation talks start, tensions rise — AZCentral.com #CRWUA2023 #COriver #aridification

From left, J.B. Hamby, chair of the Colorado River Board of California, Tom Buschatzke, Arizona Department of Water Resources; Becky Mitchell, Colorado representative to the Upper Colorado River Commission. Hamby and Buschatzke acknowledged during this panel at the Colorado River Water Users Association annual conference that the lower basin must own the structural deficit, something the upper basin has been pushing for for years. CREDIT: TOM YULSMAN/WATER DESK, UNIVERSITY OF COLORADO, BOULDER

Click the link to read the article on the AZCentral.com website (Brandon Loomis). Here’s an excerpt:

December 14, 2023

The seven states that share the Colorado River’s water celebrated some conservation wins at their annual meeting here this week but quickly began sparring over who will bear the brunt of future pain that they agree a drying climate will dole out. Talk of cutbacks has long focused on the three states collectively known as the Lower Basin — Arizona, California and Nevada — and on Wednesday, representatives of California water districts and tribes signed federally funded deals to leave more water in the river’s largest reservoir over the next two years. On Thursday, interstate rivalries re-emerged as officials from the Upper Basin made clear they expect the Lower Basin to cut back much further before coming after their water. Farmers and other users in the headwaters states of Wyoming, Utah, Colorado and New Mexico already go without in dry years because they don’t have a giant storage pool like the Southwest’s Lake Mead to augment nature…

September 21, 1923, 9:00 a.m. — Colorado River at Lees Ferry. From right bank on line with Klohr’s house and gage house. Old “Dugway” or inclined gage shows to left of gage house. Gage height 11.05′, discharge 27,000 cfs. Lens 16, time =1/25, camera supported. Photo by G.C. Stevens of the USGS. Source: 1921-1937 Surface Water Records File, Colorado R. @ Lees Ferry, Laguna Niguel Federal Records Center, Accession No. 57-78-0006, Box 2 of 2 , Location No. MB053635.

The upper and lower basins split just downstream of Lake Powell’s Glen Canyon Dam, at Lees Ferry in Arizona, though Lake Powell’s storage is primarily used to ensure the Upper Basin has enough water to fulfill its yearly obligations to the Lower Basin. The Upper Basin states use roughly half as much, and less in years when mountain streams dry up, and concerns over that disparity surfaced Thursday.

“We can’t accept something that continues to drain the system, that puts 40 million people at risk,” Colorado’s river commissioner, Becky Mitchell, told her interstate colleagues at the annual Colorado River Water Users Association conference…

“The one person that you cannot negotiate with is Mother Nature. She will win every time. She’s been telling us what to do,” Mitchell said. “I want an agreement that lessens the pain for all of us, not just some of us.”

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

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