
Why did a Southwestern desert river that had usually run dry below the U.S.-Mexico border for decades briefly reach the sea again in 2014, and what did biologists find growing in the wetted corridor by season's end?
On March 23, 2014, engineers opened the gates of Morelos Dam on the Arizona–Mexico border and released 105,392 acre-feet of Colorado River water into a channel that had been dry for most of five decades. Within weeks, cottonwood and willow seedlings anchored in the wet silt, and by mid-May a thin ribbon of river reached the Sea of Cortez for the first time in a generation.















