The snowpack in southern Colorado has essentially disappeared as of May 24, 2024 [1].
This rapid depletion of mountain snow affects the timing of water runoff for critical river systems. Because the snowpack acts as a natural reservoir, an early melt can disrupt water availability for agriculture and municipal use during the drier summer months.
The event is concentrated in southern Colorado, specifically affecting the San Juan and Rio Grande River basins [1]. Reports said the current melt is expected to rank among the top five earliest melt events ever recorded for the San Juan River basin [2].
Similar trends are appearing in the Rio Grande River basin. The melt in that region is also likely to rank among the top five earliest melt events on record [2].
Water managers typically monitor these basins to predict streamflow and manage reservoir levels. When the snowpack vanishes this early in the season, it shifts the peak flow of rivers forward, potentially leaving lower-elevation areas with reduced water supplies later in the year. The speed of this event marks a significant deviation from typical seasonal patterns in the region [1].
“The snowpack in southern Colorado has essentially disappeared”
An exceptionally early snowmelt in the San Juan and Rio Grande basins suggests a shift in the hydrological cycle for southern Colorado. When peak runoff occurs too early, it increases the risk of late-summer droughts and water shortages, as the natural 'slow-release' mechanism of the snowpack is removed before the hottest months of the year.
