OTTER TAIL COUNTY, Minn. — The Minnesota Department of Natural Resources has confirmed individual zebra mussels in Swan Lake in Otter Tail County.

Mineral Lake and several small, unnamed lakes connected to and downstream of Swan Lake will also be listed for zebra mussels. All of these lakes flow into North Ten Mile Lake, which was listed for zebra mussels in 2017.

DNR invasive species specialists have conducted several searches of Swan Lake since a lake property owner brought in a dead adult zebra mussel her daughters found while swimming in the lake in July. The DNR conducted a further equipment search Oct. 9 and found one live juvenile zebra mussel about 200 yards from the location of the July report.

Lake property owners should carefully check boats and trailers, docks and lifts, and all other water-related equipment for invasive species when removing equipment for seasonal storage.

Whether or not a lake is listed as infested, Minnesota law requires boaters and anglers to:

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  • 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.

More information is available at