An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Research Vessel Lake Guardian Returns to Port After a Successful Field Season

In early October, the research vessel Lake Guardian returned to its home port in Milwaukee, Wisconsin, after a busy field season of offshore surveillance on all five Great Lakes. Among other activities, the Guardian monitored the low-oxygen “dead zone” in Lake Erie, hosted teacher trainings and public tours, and conducted several intensive studies of Lake Ontario.  

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.