Boaters travelling the waters in and around Voyageur's National Park are being advised to use extreme caution.
The park will be removing hazard markers and buoys it maintains from the water beginning tomorrow.
Park officials have also issued an advisory that hunting and trapping within the park boundary's is prohibited.
They add they'll be enforcing federal regulations which carry a maximum penalties up to $10,000 or 6 months in jail for misdemeanour violations and $20,000 or 5 years in jail for felony convictions.