EWM in Lake Carlos

Eurasian Watermilfoil (EWM) is an invasive species that causes recreational, economic and ecological damage—changing how residents and visitors use and enjoy a lake.

Eurasian watermilfoil (EWM) impacts (from Minnesota DNR website):

  • Dense mats at the water’s surface inhibit water recreationists.
  • Overtakes habitat and outcompetes native aquatic plants, potentially lowering diversity.
  • Provides unsuitable shelter, food, and nesting habitat for native animals.

EWM was first found in Lake Le Homme Dieu several years ago.  Because the water flows from Lake Le Homme Dieu into Lake Carlos, and boat traffic moves throughout the Chain, it was just a matter of time before EWM would enter Lake Carlos.   To address this threat, the Lake Carlos Area Association (LCAA) contracted with Blue Water Science, a firm that specializes in advising lake association on issues such as invasive species, to conduct a lake survey and treat the weed.  For the past two years LCAA paid to complete the lake surveys and treat areas where EWM has been found.  Fortunately, the spots of EWM have been few and small spots, and the treatments have been successful.

A report was prepared by Blue Water Science for the Lake Carlos Area Association in 2021. It concluded that  “EWM was generally observed at light densities and sparse distribution” and almost 2 acres were treated with a herbicide.   The LCAA is very concerned about the recurring finding of EWM and will continue to monitor and treat where necessary.

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