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LakeQuality

Banded Mystery Snail

Invasive SpeciesFound in 363 lakes

Banded Mystery Snail appears on state infested-waters lists for 363 surface waters. Boaters and anglers moving gear in or out of those lakes carry a clean-drain-dry obligation under state law. A 363-lake footprint means Banded Mystery Snail prevention has shifted from "stop the spread" to "manage the new normal." Watercraft-inspection programs at boat launches and shoreline-management practices on individual lakes are doing most of the active prevention work.

The presence of Banded Mystery Snail does not directly change a lake's LakeGrade rubric score — the grade measures the water itself, not the species inhabiting it. But invasive presence is a meaningful adjacent signal worth reading alongside the grade.

363
Total Lakes
363
Wisconsin

Lakes with Banded Mystery Snail

LakeCountyStateGradeDepth
Geneva LakeWalworthWIA135 ft
Deep LakeAdamsWIA49 ft
Beasley LakeWaupacaWIA47 ft
Bass LakeOcontoWIA40 ft
Explosion LakeOcontoWIA-
Lake LucerneForestWIA73 ft
Lake MetongaForestWIA79 ft
Round LakeSawyerWIA74 ft
Clear LakeSawyerWIA32 ft
Razorback LakeVilasWIA35 ft
Long LakeBurnettWIA41 ft
North LakeFlorenceWIA43 ft
Wolf LakeAdamsWIA58 ft
Butternut LakeForestWIA42 ft
Green LakeOcontoWIA25 ft
Archibald LakeOcontoWIA50 ft
Eagle LakeMarinetteWIA30 ft
Big LakeVilasWIA30 ft
Boot LakeOcontoWIA38 ft
Squash LakeOneidaWIA74 ft
Thunder LakeMarinetteWIA62 ft
White LakeMarquetteWIA60 ft
White LakeLangladeWIA42 ft
Shell LakeWashburnWIA36 ft
Alva LakeOneidaWIA43 ft
Rose LakeLangladeWIA24 ft
Ebert LakePortageWIA30 ft
Star LakeOcontoWIA21 ft
Franklin LakeForestWIA46 ft
Big Portage LakeVilasWIA40 ft
Rinehart LakePortageWIA27 ft
Forest LakeVilasWIA60 ft
Fish LakeWausharaWIA37 ft
Sea Lion LakeFlorenceWIA82 ft
Half Moon LakePolkWIA60 ft
Blueberry LakeSawyerWIA29 ft
Pearl LakeWausharaWIA45 ft
Lower Eau Claire LakeBayfieldWIA41 ft
Ballard LakeVilasWIA25 ft
Bear Paw LakeOcontoWIA20 ft
Blue LakeOneidaWIA49 ft
Dutch Hollow LakeSaukWIA38 ft
Little Crawling Stone LakeVilasWIA44 ft
Grindstone LakeSawyerWIA60 ft
Long Interlaken Lake DeepVilasWIA65 ft
Middle Eau Claire LakeBayfieldWIA66 ft
White Sand LakeVilasWIA71 ft
Halfmoon LakeOcontoWIA38 ft
Parker LakeAdamsWIA36 ft
Fence Lake DeepVilasWIA86 ft

Showing 50 of 363 infested lakes.

Frequently Asked Questions

How many lakes have banded mystery snail?

Banded Mystery Snail has been documented in 363 graded lakes: 363 in Wisconsin.

Does banded mystery snail affect water quality?

Invasive species can significantly affect lake ecosystems. They may alter nutrient cycling, displace native species, and change water clarity. Lakes with banded mystery snail should be monitored for changes in water quality over time.

Source: EPA National Aquatic Resource Surveys, 2026.