Disaster averted on #ColoradoRiver — for now — thanks to wet winter and states’ plan to conserve water, feds say — The #Denver Post

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.

Click the link to read the article on The Denver Post website (Elise Schmelzer). Here’s an excerpt:

The chances that water levels will fall below critical elevations before 2027 are now 8% at Lake Powell and 4% at Lake Mead, according to the new analysis. Previous estimates, based on September 2022 data and an assumption that nothing would change in the management of the reservoirs, had found a 57% chance of critically low elevations at Lake Powell and 52% at Lake Mead. With the improved forecasts, the federal government appears poised to move forward with a plan by the seven states in the Colorado River Basin to reduce use for the next three years. Earlier this year, federal officials proposed forcibly cutting the amount of water sent downstream to the Lower Basin if the states could not find a compromise on reducing use. On Wednesday, the officials said they had ruled out those forced cuts…

The Bureau of Reclamation now will undertake a more thorough analysis of the states’ plan. The plan, created by the three Lower Basin states — California, Arizona and Nevada — would reduce water use by those states by 3 million acre-feet over the next three years. Most of that reduced use would be achieved through projects paid for by federal money from the Inflation Reduction Act, including conservation projects in Tucson and Phoenix. The four Upper Basin states — Colorado, New Mexico, Wyoming and Utah — signed onto the plan this spring.

Colorado’s top negotiator for the river said in a news release Wednesday that she and her team were reviewing the revised federal analysis and considering whether the analysis can “provide meaningful and enforceable reductions in use to address near-term challenges facing the Colorado River System.”

“If there’s a lesson to be learned from the last few years, it is that we must live within the means of the river if we hope to sustain it,” said Becky Mitchell, the state’s Colorado River commissioner.

Colorado River “Beginnings”. Photo: Brent Gardner-Smith/Aspen Journalism

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