Otter Tail County Lake Added to List of Zebra-Mussel-Infested List

Otter Tail County Lake Added to List of Zebra-Mussel-Infested List Click to Enlarge

UNDATED--An Otter Tail County Lake is one of two Minnesota lakes recently confirmed to be infested with zebra mussels. The Minnesota DNR has confirmed West McDonald Lake in Otter Tail County and Grants Lake in Douglas County have zebra mussels.

According to the DNR, following a credible report of a single adult zebra mussel in West McDonald Lake last month, DNR divers searched three areas of the lake. They examined more than 2,000 objects in the lake and did not find zebra mussels. During a follow-up search, DNR divers found two zebra mussels about 700 feet from the location of the original report.

During a treatment operation for a recently confirmed small population of the invasive plant flowering rush in Grants Lake, specialists from Douglas County and the DNR found multiple zebra mussels on a settlement sampler hanging on a dock. Settlement samplers are solid surfaces placed in the water that people can regularly check for attached zebra mussels.

On all lakes and rivers in Minnesota, Minnesota law requires boaters and anglers to:

Clean watercraft and trailers of aquatic plants and prohibited invasive species.

Drain all water by removing drain plugs and keeping them out during transport.

Dispose of unwanted bait in the trash.

According to the DNR, Some invasive species are small and difficult to see at the access. To remove or kill them, take one or more of the following precautions before moving to another body of water:

Spray with high-pressure water.

Rinse with very hot water (120 degrees for at least two minutes or 140 degrees for at least 10 seconds).

Dry for at least five days.

People should contact an area DNR aquatic invasive species specialist if they think they have found an invasive species that has not already been confirmed in a lake.

More information is available at

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