Lake Josephine was diagnosed with an aggressive invasion of Eurasian Water Milfoil in late 2012. Eurasian Water Milfoil (EWM), is a contamination that cannot be eradicated, and requires aggressive and ongoing treatment to control. Left unchecked, it can overtake a lake, making it unnavigable by boats and unsafe for swimming and water sports.
As an example, Lake Minnetonka has also had significant problems with EWM. It was first found in 1996 in one bay, which has nearly been choked out. It has now spread to multiple parts of the lake, impacting swimming and boating. Two drownings have been attributed to the weed infestation. One victim was a member of the U of M swim team, who was training in the lake. Lakeshore property owners in impacted areas have seen their home values plummet 30-50%. Each spring through Fall, lake residents have to harvesters operating full-time to try to remove the weeds, at a cost of $200,000.
A picture paints a thousand words. The pictures were taken May of 2015 on Lake Josephine, showing how aggressive our EWM and Filamentous Algae infestations are.
Below are some links with more information concerning Aquatic Invasive Specifies: