Shared Enterprise Geodata and Services (SEGS) provides an EPA-curated collection of recommended geodata assets that are nationally relevant and support the Agency’s mission to protect human health and the environment. By connecting EPA users with curated datasets and promoting service reuse, SEGS aims to enhance information access, reduce data-storage costs, and improve the consistency and quality of data at the US EPA.

Developed by the U.S. EPA Office of Air and Radiation, this content item depicts trends in April snowpack in the western United States from 1955 to 2022, measured in terms of snow water equivalent. Blue circles represent increased snowpack; red circles represent a decrease. Data come from nearly 700 permanent measuring stations overseen by the U.S. Department of Agriculture's Natural Resources Conservation Service (NRCS) Water and Climate Center and the California Department of Water Resources. These data were supplemented with those published by Mote and Sharp (2005) and Mote et al. (2018). For more information, please visit the U.S. EPA climate change indicators webpage. These data and their corresponding metadata records can be downloaded from the EPA Environmental Dataset Gateway (EDG).