National Rivers and Streams Assessment 2008-2009 Results

The NRSA 2008-2009 report presents the results of an unprecedented national scale sampling effort undertaken by the U.S. EPA and its state and tribal partners to assess the condition of perennial rivers and streams in the conterminous United States based on data collected in 2008-09. The most recent assessment is the NRSA 2018-19 report.

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