Colorado River flows are at some of their lowest levels since records have been kept.

Tom Buschatzke is the director of the Arizona Department of Water Resources. On PBS’s "Arizona Horizon," he explained the reason for those lows.

"It is very telling," Buschatzke said. "The peak flows arriving earlier are a function of the climate getting warmer, snow melting sooner and then you end up with less runoff even with the same equivalent amount of snow that you’ve had in the past.”

Arizona and other states rely on the lessening Colorado River water, and at the same time drought is expanding in Arizona.