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Prepared by U.S. EPA, this report is the first consistent evaluation of the streams that feed rivers, lakes, and coastal waters. "Wadeable streams" are those which are shallow enough to be adequately sampled without a boat. Conducted between 2000 and 2004, the study was based on sampling at 1,392 sites selected to represent the condition of all streams that share similar ecological characteristics in various regions. It was a collaborative effort that involved dozens of state environmental and natural resource agencies, federal agencies, universities and other organizations. More than 150 field biologists were trained to collect environmental samples using a standardized method.

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Last Updated: July 31, 2017