By Ian James | Arizona Republic
Arizona, Nevada and Mexico will start taking less water from the Colorado River in January as a hard-fought set of agreements kicks in to reduce the risk of reservoirs falling to critically low levels.
The two U.S. states agreed to leave a portion of their water allotments in Lake Mead under a deal with California called the Lower Basin Drought Contingency Plan, or DCP, which the states’ representatives signed at Hoover Dam in May.
California agreed to contribute water at a lower trigger point if reservoir levels continue to fall. And Mexico agreed under a separate accord to take steps to help prop up Lake Mead, the nation’s largest reservoir near Las Vegas, which now sits 40% full after a nearly 20-year run of mostly dry years.
The agreements, including another deal in the river’s Upper Basin, increase the odds of Western states making it through the next seven years without reservoir levels crashing. But researchers examining the latest climate projections have also warned of the possibility that declines in the river’s flow could force water curtailments in the coming years, and they’ve suggested looking at options to reduce risks.