Minnesota · Public Health
Aquatic Invasive Species
Tracking 1,013 Minnesota lakes for zebra mussels, Eurasian watermilfoil, spiny waterflea, and more — with watercraft guidance for every water you fish.
866
Confirmed AIS Lakes
147
County-Suspected
961
High-Pressure Waters
Scoring Model
How Pressure Scores Are Calculated
Each lake's AIS pressure score combines two signals: the number of species confirmed at the lake level (10 points each), and a county-wide pressure index based on the share of lakes in the county with confirmed AIS (0–25 points).
Pressure bands: High (score ≥ 20), Moderate (≥ 10), Low (< 10). A lake labeled “High — County Suspected” has no confirmed lake-level detections — its score comes from county pressure alone. data_quality = 'suspected_only' marks these lakes.
NomadPath tracks 1,013 of Minnesota's 11,232 DNR-monitored waters — roughly 9% coverage. Lakes outside this dataset are not necessarily AIS-free; they're simply outside the current monitoring footprint.
Clean, Drain, Dry — Every Time
Minnesota law requires all watercraft operators to follow Clean, Drain, Dry procedures before leaving any water access. AIS can hitchhike on hull, trailer, and gear — even on lakes not listed here.
Inspect hull, motor, and trailer. Remove all aquatic plants and animals.
Drain livewell, baitwell, bilge, and any other water-holding compartment.
Never transport water from one water body to another.
Dry boat and equipment for at least 5 days before use on another water.
Violations may result in a fine up to $200. Report suspected AIS to the MN DNR Tip Line: 1-888-646-6367.
AIS data sourced from the Minnesota Department of Natural Resources AIS monitoring program. Pressure scores computed by NomadPath from DNR lake-level detection records and county monitoring coverage. Data reflects records available as of the most recent ingestion cycle. Always verify current AIS status with the MN DNR before accessing any water body. NomadPath does not guarantee data completeness or accuracy — 91% of monitored waters fall outside our current dataset.