It seemed like Colorado River basin states were ahead of the curve in 2007 when we enacted a 20-year set of guidelines that spelled out what would happen if Lake Mead were to ever fall into a shortage.

But a decade later, as water levels at the lake plummeted, it was clear that we hadn’t planned nearly enough for shortage. A “stress test” that better accounted for more recent drought conditions revealed that if we didn’t do more to prop up water levels, there was an unacceptably high chance of the lake tanking within a few years.