Oregon Snowpack Summary Maps and Graphs. Products are current as of today's data. Some documents below require Adobe Acrobat offsite link image. Snow pillow installations. These bladders are filled with fluid that is used to measure the weight of the snowpack, which is converted to snow water equivalent. Stay Connected USDA In Facebook NRCS In Twitter NRCS In Youtube NRCS In Mail USDA In SNOTEL Basin Time Series Snowpack Summary Graphs.