Federal officials aren’t ready to give states along the Colorado River a new deadline for water conservation goals.

The seven states that rely on the river blew past an August 16 deadline without a plan to conserve 2 to 4 million acre-feet of water. They were given that task by officials with the Bureau of Reclamation and from within the Interior Department. The agency’s models show that amount is what is necessary to keep the river’s biggest reservoirs — lakes Mead and Powell — from reaching critical levels.