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Data can be retrieved by specific US Geological Survey (USGS), National Water Quality Assessment (NAWQA) and US Environmental Protection Agency (US EPA), National Rivers and Streams Assessment (NRSA) protocols. NAWQA algae, invertebrate and fish samples are collected at a reach scale and specific sampling protocols can be found in a USGS Open-file report at http://pubs.usgs.gov/of/2002/ofr-02-150/. NAWQA revised methods for characterizing stream habitat can be found in a USGS Water Resources Investigations Report at http://pubs.usgs.gov/wri/wri984052/. EPA National Rivers and Streams Assessment (NSRA) protocols are contained in several documents that can be found at http://water.epa.gov/type/rsl/monitoring/riverssurvey/.
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