Measuring snowpack
Rich Pedroncelli/AP Photo
In this Feb. 1, 2018 file photo Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program, for the Department of Water Resources, checks the snowpack depth as Courtney Obergfell, left, and Michelle Mead, center, both of the National Weather Service, look on during the second snow survey of the season near Echo Summit, Calif. A new study led by scientists at Oregon State University has found that snowpack has declined dramatically across the American West over the past century.