The Colorado River supplies water for more than 36 million people in two countries and seven states, including New Mexico. As river flows and reservoir levels decline due to drought, warming and over-demand, states are wrangling over how to voluntarily conserve water use—before reservoir levels reach critically low levels and trigger mandatory cutbacks. New Mexico is one of the states most vulnerable to the impacts climate change is wreaking on the river. Yet, it’s unclear what the state is doing when it comes to drought management in the state and basin-wide negotiations on the Colorado. The seven states subject to the Colorado River Compact are divided into Upper Basin states—Wyoming, Colorado, New Mexico and Utah—and Lower Basin states—Arizona, Nevada and California.
The Colorado River supplies water to seven states, including New Mexico, before crossing the border into Mexico. Then—theoretically, nowadays—it reaches the Sea of Cortez. Demands from cities and farms, along with climate change, strain the river and affect its flows. Now, a new study shows that even though annual precipitation increased slightly between 1916 and 2014, Colorado River flows declined by 16.5 percent during that same time period. That’s thanks, in large part, to “unprecedented basin-wide warming.” Warming reduces snowpack and increases the amount of water plants demand.
LA CIÉNEGA DE SANTA CLARA, MÉXICO— Alejandra Calvo crosses a barren stretch of desert in Sonora, México almost daily during certain times of the year. The route could easily disappear beneath blowing dust and when rain does fall here, it renders the road impassable. There are no birds or wildlife here, not even any visible plants. It wasn’t always like this: Until the 1960s, the Colorado River spread across this delta on its path to the Sea of Cortez. Originally from Chiapas, Calvo is a biologist who works for ProNatura Noroeste, a conservation group based in northwestern Mexico.
Over the next week, New Mexico Political Report will be reporting from…not New Mexico. Instead, we’ll be taking a closer look at the Colorado River. The Colorado delivers water to more than 36 million people in seven states and two countries. Its waters carved the Grand Canyon and, far more recently, allowed the growth of Sunbelt cities like Phoenix and Tucson. (No, neither is near the Colorado.