About 90 percent of the Colorado River's water comes from snowmelt in the Upper Colorado River Basin, a large swath of Colorado, Utah and Wyoming.
Snowpack is decent near the Continental Divide. But places farther south are setting new records for lack of snow.
"We still remain behind typical conditions for this time of year in terms of open terrain and base depth," said Vail CEO Rob Katz.
Overall, the river serves more than 40 million people in cities, farms and tribes in Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming. Mexico also gets a share.