GREON Sites Active La Crosse, WI - Mississippi River Main Channel Decatur, IL - Lake Decatur Alton, IL - Mississippi River Backwater Shelbyville, IL - Lake Shelbyville Carlyle, IL - Carlyle Lake Upper Basin Carlyle, IL - Carlyle Lake Lower Basin Willard, IL - Mississippi River Backwater Historical Stoddard, WI – Mississippi River Backwater Alton, IL - Mississippi River Main Channel Cape Girardeau, MO - Mississippi River Main Channel