The word “crisis” ended a Colorado River conference that drew representatives from Southwest U.S. states, tribes and Mexico to Las Vegas this week.

A top Interior Department official closed the Colorado River Water Users Association conference on Friday calling the next three months critical for agreements to deal with drought and climate change.

One deadline is next Tuesday, when federal water managers close public comment on an effort expected to yield a plan by summer to use at least 15% less river water split among seven Western U.S. states, 30 Native American tribes and Mexico.