Lake Minnewashta zebra mussel treatment begins

CHANHASSEN, Minn. - Crews have begun treating a popular west metro lake in an effort to rid it of zebra mussels. 

Treatment of a 29 acre acre parcel of Lake Minnewashta follows the discovery of more than a dozen juvenile zebra mussels near a boat launch in August. The Minnesota Department of Natural Resources (DNR) approved the use of a product called EarthTecQZ, and on Tuesday crews began applying it to a containment area around the boat launch and immediate bay. 

The treatment plan was developed by a partnership that includes the Minnehaha Creek Watershed, Carver County and the Lake Minnewashta Preservation Association. The zone being treated is approximately three times the size of a treatment attempt on nearby Christmas Lake, which was ultimately ineffective. Researchers determined that the Christmas Lake treatment zone wasn’t large enough to contain the infestation, and that the lake was infested with thousands of adult zebra mussels compared to the 14 juveniles that were found in Lake Minnewashta.

“This is our best opportunity yet to test the feasibility of in-lake treatments for zebra mussels,” said Eric Fieldseth, MCWD Aquatic Invasive Species Program Manager. “We are applying lessons learned at Christmas Lake and we are cautiously optimistic of a better outcome this time.”

The mussel treatment is expected to last 8 to 14 days: Barriers will be removed once it is complete. Since the discovery of zebra mussels at the Lake Minnewashta public access, those wishing to launch boats are being redirected by signage to the former boat launch area #2, approximately ¼ mile further into the park.      




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