-- In our focal watersheds, we find that for rivers fed
primarily by mid - to high - elevation
snowmelt (e.g., the Yellowstone at Billings, the Clark Fork at Saint Regis, and the Missouri at Toston), August flows have a strong positive relationship with winter (November - March) precipitation and a strong negative relationship with spring (April - June) temperatures.
While glacier melt contributes water to the region's rivers and streams, retreating glaciers over the next several decades are unlikely to cause significant change in water availability at lower elevations, which depend
primarily on monsoon precipitation and
snowmelt, the committee said.