Water managers from seven Southwestern states that depend on the Colorado River for drinking and irrigation water are getting closer to finalizing an unprecedented drought contingency plan they may have to enact in 2020, officials said Thursday.
The federal government's top water official, Bureau of Reclamation Commissioner Brenda Burman, was expected to urge action by representatives of Indian tribes and government agencies from Arizona, California, Colorado, Nevada, New Mexico, Utah, Wyoming during an address at an annual conference in Las Vegas.
A pact was supposed to be signed by the end of 2018, under threat that the bureau that controls the water distribution levers on the river would impose its own restrictions affecting drinking water to 40 million people and irrigation for crops in arid parts of U.S. and Mexico.
Arizona and Nevada are would be the first states to feel the pinch if a shortage is declared as expected next year. Supplies to California also could be curtailed.
After 19 years of drought and increasing demand, the river's two largest federal water managers project a 52 percent chance that the river's biggest reservoir, Lake Mead behind Hoover Dam, will fall low enough to trigger cutbacks under agreements governing the system.
The Lower Colorado River Basin states of California, Arizona and Nevada want to keep Lake Mead behind Hoover Dam above a shortage declaration trigger point by using less water than they're legally entitled to receive.
If the lake falls below that level, Arizona will face a 9 percent reduction in water supply, Nevada a 3 percent cut and California up to 8 percent. Mexico's share of river water also would be reduced.
Colorado, New Mexico, Utah and Wyoming want to keep the surface of Lake Powell above a target level to continue water deliveries to irrigation districts and cities and also keep hydroelectric turbines humming at Glen Canyon Dam.
Lake Powell is currently at 43 percent capacity and Lake Mead is at 38 percent.
Water officials in most of the affected states have signed off on plans in recent weeks, including the key Central Arizona Project irrigation system and the sprawling Metropolitan Water District of Southern California, which serves some 19 million people.
Arizona's plan, unlike other states, still needs approval from state lawmakers. They convene in January.
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