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CLWA resumes Eurasian Watermilfoil control

Under contract to the CLWA, Clear Water Lake Management, with drone assistance from Zero Gravity Aerial, completed a treatment of invasive EWM in Crystal Lake on June 29. Begun last year, this work is authorized by the Michigan Department of Environment, Great Lakes, and Energy under Aquatic Nuisance Control Permit No. ANC9805924.

Last year the CLWA team carried out two treatments on approximately 7 acres of EWM infestation, including very heavy growth at the east end of the lake. An inspection of regrowth in mid-June 2022 showed that the extent (footprint) of the plant had decreased to 5 acres and that the density (biomass) was now very sparse: a footprint reduction of almost 30% and a biomass reduction of 90%. These results reflect a high rate of success.

Unfortunately a few small new colonies of EWM have appeared since 2021. These are – tellingly – in the area of the Lobb-road end secondary launch site, which is heavily used by boaters but has no provision for hitchhiking invasives to be removed by boat washing.

Thanks to excellent weather conditions, the regrowth was fully treated on June 29. A second treatment will follow in late July.

If you have questions, see FAQs about Eurasian watermilfoil.

Protecting Crystal Lake Now for Generations to Come.

P.O. Box 89 • Beulah, MI 49617
info@crystallakewatershed.org
231.882.4001 Tel

The Crystal Lake & Watershed Association (CLWA), is a non-profit (501c3) organization.

Photography: Jay Burt and Rick Cosaro

Site by: Rick Cosaro

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