News and Events

Icy Safety - When is ice safe? - MnDNR

There really is no sure answer. You can't judge the strength of ice just by its appearance, age, thickness, temperature, or whether or not the ice is covered with snow. Strength is based on all these factors -- plus the depth of water under the ice, size of the water body, water chemistry and currents, the distribution of the load on the ice, and local climatic conditions.

Click here to read the full article

Swans in icy water aren’t always in trouble

The Department of Natural Resources asks Minnesotans to carefully consider the situation before reporting trumpeter swans or other waterfowl that appear to be trapped in ice or rapidly freezing water. While they may initially appear to be distressed, they most often are not.

Just like humans, animals behave differently when the seasons and temperatures change. It is important to not assume the worst when observing a wildlife situation. It is easy to mistake unusual animal behaviors for an animal in distress. Stop and closely observe before attempting to find help.

“Trumpeter swans are a classic example of this,” said Erica Hoaglund, central region nongame wildlife specialist. “People see them this time of year resting on frozen water or swimming about in small pockets of open water within ice. Observers assume they’re trapped when most of the time they’re not and move on in either a few days or a few weeks. It usually is not the emergency it can first appear to be.”

The DNR provides these reminders to people concerned about the fate of swans or other waterfowl they see in or near water during the early parts of winter.

Click here to read the complete Minnesota DNR News Release.

MnDNR Infested waters list updates

What’s on the list?

The Minnesota Department of Natural Resources (DNR) regularly updates the state infested waters list, which includes Minnesota lakes and rivers containing certain aquatic invasive species.

If you harvest bait, fish commercially, or divert or take water from lakes or rivers on this list, you may need to follow special regulations.

  • The most complete and up-to-date list of infested waters is an Excel spreadsheet available on the DNR website.

  • Using the Excel spreadsheet, you can sort, search or filter the list by water body name, county, species, or year. If you have questions about what the information means, see the tab called “Column descriptions”.


Questions about the infested waters list?

Contact Kelly Pennington, Aquatic Invasive Species Prevention Consultant

Questions for your local aquatic invasive species staff? Contact us



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