‘Megadrought’ along southern border strains U.S.-Mexico water relations

The United States and Mexico are tussling over their dwindling shared water supplies after years of unprecedented heat and insufficient rainfall.

Sustained drought on the middle-lower Rio Grande since the mid-1990s means less Mexican water flows to the U.S. The Colorado River Basin, which supplies seven U.S. states and two Mexican states, is also at record low levels.