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Colorado River Begins Flooding Mexican Delta

Raise The River PSA

LOS ALGODONES, Mexico — Colorado River water has begun pouring over a barren delta in northwest Mexico, the result of a landmark agreement between the U.S. and Mexico that is being celebrated Thursday.

The gush of water in Mexico is an effort to revive the last 70-mile stretch of the river into the Sea of Cortez. The once-lush river delta dried up decades ago.

“There's a lot of excitement here, perhaps even a little disbelief that it's actually happening,” Ian Wilson, a spokesperson for Sonoran Institute, said over the phone from a ceremony at Mexico's Morelos Dam, near Yuma, Ariz.


On Sunday, the dam began unleashing 105,392 acre-feet of water, which would be enough to supply more than 200,000 homes for a year. The one-time release is expected to last until May 18.

The Sonoran Institute and other environmental organizations have been busy planting seedlings in the delta in preparation for the expected water.

Farms, businesses and homes in seven U.S. states — Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming — rely on the Colorado River, as do the Mexican states of Baja California and Sonora.

The majority of San Diego County’s water supply comes from the Colorado River. It keeps our faucets running and landscapes green and it makes quite a trek to get here.

In 2012, the two countries that share the river water agreed on ways to share the pain of droughts and bounty of wet years, a major amendment to a 1944 treaty. Part of that agreement called for restoration of the Colorado River delta.

"Never before have we deliberately sent water below the Morelos Dam ... to benefit the environment," Jennifer Pitt of the Environmental Defense Fund, who helped negotiate the one-time flood, wrote on her blog this month.


"By abandoning the old framework of 'who gets what' and establishing cooperative management of our shared resource, the U.S. and Mexico are achieving benefits for communities and nature alike."

The one-time release of water was achieved through water conservation projects by the U.S. and Mexico, according to the International Boundary and Water Commission. Environmental groups are raising money to buy up water rights in Mexico in order to establish a base flow of Colorado River water.

Experts will monitor the flood to determine its effects on the environment. Conservationists hope the water will bring back trees, wildlife and aquatic life that were once abundant in the region when it was teeming with water decades ago.

Wilson from the Sonoran Institute said the river water had made it about five miles south of the border on Thursday, and that it was traveling at between 1 to 1.5 kilometers per hour.

The Sea of Cortez is about 70 miles, or 113 kilometers, south of Morelos Dam.