NRSA Data 2008,2009, 2013, 2014
Rivers and Streams data for the National Aquatic Resource Surveys. 

This dataset is associated with the following publication:
Herlihy, A., J. Sifneos, R. Hughes, D. Peck, and R. Mitchell. The Relation of Lotic Fish and Benthic Macroinvertebrate Condition Indices to Environmental Factors Across the Conterminous USA. …