GEMS

Welcome to the Geospatial Environmental Mapping System

The Geospatial Environmental Mapping System (GEMS) was designed to provide dynamic mapping and environmental monitoring data for sites managed by the U.S. Department of Energy (DOE) Office of Legacy Management (LM). The information and tools made available in GEMS are the result of input from various stakeholders including DOE and contractor staff, regulatory agencies, and members of the public. All LM sites are listed in GEMS, but they may not appear in the same way as in the official LM Site Management Guide. For example, the guide lists the Durango, CO, Disposal/Processing Site, whereas GEMS lists it as two separate entries: Durango, CO, Disposal Site and Durango, CO, Processing Site. In early 2026, GEMS will be updated to align with the LM Site Management Guide.

GEMS Version 4.1

On February 25th, the GEMS website was updated from version 4.0 to version 4.1, implementing charting and additional reporting functionality. Please refer to the User Guide for details. The User Guide is found on the third tab within the Information pop-up page.

U.S. Department of Energy (DOE) Office of Legacy Management Data Disclaimer

The DOE Office of Legacy Management (LM) makes no representation or warranty, expressed or implied, regarding the use, accuracy, availability, or completeness of the data presented herein, or from any map printed from these data. The act of distribution shall not constitute such a warranty. LM does not guarantee that the digital data or any map printed from this program will be free of errors or inaccuracies. LM holds no responsibility or liability for interpretations made from these digital data or from any map printed from these digital data, nor is LM responsible for any decisions based on the digital data or printed maps. LM retains sovereign immunity.

Learn about the Department of Energy's Vulnerability Disclosure Program