Committee Spotlight: Stormwater
Historic Flooding in Yellowstone National Park
By: Shannon Kronz, EIT, Brown, and Caldwell
The beginning of the 2022 water year led to drought conditions throughout the Pacific Northwest region. In April, southwest Montana and surrounding areas experienced higher than average precipitation, which led to increased snowpack in the Yellowstone River watershed. A few months later, between June 10 and13, an atmospheric river brought 0.8-5 inches of rain to the Absaroka and Beartooth mountain ranges, located northeast of Yellowstone. The significant amount of rain from the atmospheric river also caused the snowpack to melt, which, combined, was equivalent to 4-9 inches of rain. The large quantity of precipitation caused historic flooding downstream on the Yellowstone River [1].