You will start seeing the flags next summer for a good indication of algae conditions in our lake and suggested actions. A good plan that had been adopted by Westlake Village west of Rockford.
Grey flag means low concern of acute health effects
Yellow flag means moderate concern and swimming should be limited.
Red flag means there is high concern of acute health effects and swimming should be prohibited as well as other water contact activities.
Black flag means a very high concern of acute health effects and the lake should be closed to all activities.