This week it was announced that Lake Mead — a major source of Colorado River water — will drop to levels not seen since the resesrvoir was filled in the 1930s.

The U.S. Bureau of Reclamation’s regional director says water obligations will be met at least through next year to cities like Phoenix, Los Angeles and Las Vegas.

But what about after that?

We spoke to Dave White, director of Arizona State’s Decision Center for a Desert City.