http://www.mprnews.org/story/2015/10/23/zebra-mussels
Despite extraordinary and expensive measures to treat Zebra Mussels found in Christmas Lake, they have reappeared this fall. As a result, the Department of Natural Resources has ended all efforts to eliminate them. Preventing zebra mussels from entering lakes and waterways in the first is place is the only current hope. Read more in the MPR News story by clicking on the link above.