The West is locked in the grip of a 20-year megadrought, with the Colorado River approaching record-low flows.

The seven states in the Colorado River basin—Colorado, New Mexico, Utah and Wyoming in the upper basin and Arizona, California and Nevada in the lower—established drought contingency plans in 2019 for managing and operating the river in the ongoing crisis. They’re the latest piece of the “Law of the River,” which allocates water to the seven states.