Report to the Illinois Environmental Protection Agency based on macro-invertebrate sampling of 151 sites in 1976 and 1977, to evaluate the impact of 17 point sources, and additional sampling to evaluate agricultural non-point source pollution. The predominant stream classification for sampling sites was "unbalanced" (52% of sites); and 39% of sites were found to be "semi-polluted".

Report to the Illinois Environmental Protection Agency based on macro-invertebrate sampling of 149 sites in July 1976 to evaluate the impact of 35 point sources, with additional sampling to evaluate agricultural non-point source pollution. The predominant stream classifications for sites sampled were "unbalanced" (47% of sites) and "semi-polluted (48% of sites).

Report to the Illinois Environmental Protection Agency based on macro-invertebrate sampling of 517 sites in 1976 to evaluate the impact of 134 point sources, with additional sampling to evaluate agricultural non-point source pollution. The predominant stream classification found was "unbalanced" (54% of sites); 38% of sites were classified as "semi-polluted."

Protection Agency based on macro-invertebrate sampling of over 800 sites in 1976-1977 to evaluate the impact of 200 point sources, with additional sampling to evaluate agricultural non-point source pollution. The predominant stream classification reported was "unbalanced" (48% of sites), and 40% of sites were found to be "semi-polluted."