From CBS4Denver.com:
Dillon Reservoir is full to the brim. It’s fed by the Upper Colorado River Basin, and the basin’s water supply is at 113 percent of average. The statewide average is at 106 percent of average. That’s a healthy supply but Denver Water still has a message…
Because June was so warm and dry, much of the snowpack melted at once. That means the water levels will slowly drop as they are drawn down by demand — mostly from the Front Range.