News Release

Zebra mussel confirmed in Long Lake, Ramsey County

September 19, 2019


The Minnesota Department of Natural Resources has confirmed a zebra mussel found by a contractor conducting an early detection survey in Long Lake in Ramsey County. 

A contract diver found an adult zebra mussel attached to a native mussel near the public access on Long Lake. DNR and Ramsey County staff did not find additional zebra mussels during a follow-up search. They noted that water clarity was poor and weather was overcast, so additional searches will be needed to determine whether there is an established zebra mussel population in Long Lake.

As with any such confirmation, Long Lake is listed for zebra mussels and invasive species signage has been posted at accesses. The DNR and Ramsey County will continue to monitor Long Lake for zebra mussels and other aquatic invasive species.

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 and report suspected new invasive species to the DNR.

It is especially important to follow Minnesota’s law and keep docks and boat lifts out of the water for at least 21 days before putting them into another body of water. This state law is central to the training DNR-permitted lake service provider businesses receive.

Anyone transporting a dock or lift from a shoreline property to another location for storage or repair may need a permit, to help prevent the spread of aquatic invasive species.

The DNR recommends these steps for lake property owners:

  • Look on the posts, wheels and underwater support bars of docks and lifts, as well as any parts of boats, pontoons and rafts that may have been submerged in water for an extended period.
  • Hire DNR-permitted lake service provider businesses to install or remove boats, docks, lifts and other water-related equipment. These businesses have attended training on Minnesota’s aquatic invasive species laws and many have experience identifying and removing invasive species.

People should contact an area DNR aquatic invasive species specialist if they think they have found zebra mussels or any other invasive species.

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.

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 waterbody:

  • 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.

Zebra mussels can compete with native species for food and habitat, cut the feet of swimmers, reduce the performance of boat motors, and cause expensive damage to water intake pipes.

More information is available on the aquatic invasive species page.