Sharon E. Kroening 1999 <p>Fecal coliform and <i>Escherichia coli</i> (<i>E. coli</i>) concentrations were determined in the St. Croix National Scenic Riverway to assess whether pathogenic organisms pose a potential problem for recreational use. Samples were collected from May through September 1999 at 22 locations on the St. Croix and Namekagon Rivers. No concentrations exceeded water-quality criteria or standards set by the U.S. Environmental Protection Agency or the states of Minnesota and Wisconsin. Maximum fecal coliform and <i>E. coli</i> concentrations were measured in the St. Croix River at St. Croix Falls, Wisconsin. Median fecal coliform and <i>E. coli</i> concentrations were greater in the St. Croix River near Woodland Corner, Wisconsin, and at Marine on St. Croix, Minnesota than at other locations sampled. There were no consistent short-term variations in fecal coliform or <i>E. coli</i> concentrations during the summer period or any significant relations between concentrations and stream discharge, based on these results.</p> application/pdf 10.3133/wri20004214 en U.S. Geological Survey Fecal coliform and <i>Escherichia coli</i> bacteria in the St. Croix National Scenic Riverway, Summer 1999 reports