An aerial reconnaissance study was conducted along pre-designated segments of the shoreline of Lake Michigan on September 14, 1972. The purpose of this remote sensing study was to document the extent of thermal discharges from the major electric power plants over the area extending from Muskegon, Michigan, to Twin Creeks, Wisconsin and to see if they are following the recommendations of the Lake Michigan Enforcement Conference. Nine of the ten plants covered were violating the recommended 3 F maximum temperature increase at the distance of 1,000 feet from an outfall. In addition, six of the power plants were also violating this permitted 3 F increase even at a distance of 2,000 feet from the plant discharge. It was also observed that the thermal plumes from some sources were overlapping. It was concluded that the recommendations of the Lake Michigan Enforcement Conference are not being met by many sources of thermal and industrial discharges within the Conference area.