As Western water managers get set to gather in Las Vegas this week, a long-sought deal to curtail water use along the cratering Colorado River still seems a ways off. Nearly six months have passed since Bureau of Reclamation Commissioner Camille Touton first asked the Western states to come up with a plan to cut back on water use from the river next year by as much as 30 percent, but a cohesive proposal from the seven states that pull from the Colorado that supplies water to some 40 million people has yet to emerge.