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Welcome to Great Lakes Monitoring!

This site tracks resources for building and maintaining the Great Lakes Monitoring system. GLM provides easy access to long-term, environmental monitoring data collected throughout the Great Lakes. There are a range of environmental parameters to choose from such as nutrients, contaminants and physical properties of water from various sources. Some features are:

  • Explore trends across the basin and visualize available data from a variety of sources
  • Compare data among various locations or parameters
  • Search for specific data and download

This project is based on two core technologies:


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