Chinese Mystery Snail
Invasive SpeciesFound in 501 lakes
Chinese Mystery Snail appears on the {{stateName}} infested-waters lists for 501 surface waters. Boaters and anglers moving gear in or out of those lakes carry a clean-drain-dry obligation under state law. A 501-lake footprint means Chinese 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 Chinese 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.
Lakes with Chinese Mystery Snail
| Lake | County | State | Grade | Depth |
|---|---|---|---|---|
| Lac Courte Oreilles Lake | Sawyer | WI | A | 90 ft |
| Towanda Lake | Vilas | WI | A | 27 ft |
| West Bay Lake | Vilas | WI | A | 23 ft |
| West Bay Lake | Vilas | WI | A | 31 ft |
| Long Lake | Burnett | WI | A | 41 ft |
| Long Lake | Lincoln | WI | A | 64 ft |
| Long Lake | Fond du Lac | WI | A | 47 ft |
| Chain Lake | Chippewa | WI | A | 74 ft |
| Upper Eau Claire Lake | Bayfield | WI | A | 92 ft |
| Spring Lake | Washburn | WI | A | 24 ft |
| Black Hawk Lake | Iowa | WI | A | 42 ft |
| Spider Lake | Vilas | WI | A | 43 ft |
| Silver Lake | Barron | WI | A | 91 ft |
| Silver Lake | Washburn | WI | A | 28 ft |
| Silver Lake | Vilas | WI | A | - |
| Silver Lake | Forest | WI | A | - |
| Pleasant Lake | Waushara | WI | A | 24 ft |
| Stella Lake | Oneida | WI | A | 22 ft |
| Birch Lake | Vilas | WI | A | 45 ft |
| Birch Lake | Oneida | WI | A | 27 ft |
| Goose Lake | Adams | WI | A | 18 ft |
| Wind Lake | Polk | WI | A | - |
| Bass Lake | Barron | WI | A | - |
| Bass Lake | Marinette | WI | A | 65 ft |
| Bass Lake | Oconto | WI | A | 40 ft |
| Bass Lake | Washburn | WI | A | 31 ft |
| Bass Lake | Lincoln | WI | A | 40 ft |
| Bass Lake | Washburn | WI | A | 35 ft |
| Bass Lake | Oconto | WI | A | 25 ft |
| Weber Lake | Iron | WI | A | 39 ft |
| Big Portage Lake | Vilas | WI | A | 40 ft |
| Pewaukee Lake | Waukesha | WI | A | 45 ft |
| Bear Lake | Oneida | WI | A | 20 ft |
| Bear Lake | Oconto | WI | A | 20 ft |
| Bear Lake | Waupaca | WI | A | 62 ft |
| Bear Lake | Barron | WI | A | 87 ft |
| Bear Lake | Portage | WI | A | 28 ft |
| Big Lake | Vilas | WI | A | 30 ft |
| Lily Lake | Brown | WI | A | 19 ft |
| Pine Lake | Shawano | WI | A | 35 ft |
| Pine Lake | Polk | WI | A | 34 ft |
| Grindle Lake | Oconto | WI | A | 23 ft |
| Anderson Lake | Oconto | WI | A | 40 ft |
| Planting Ground Lake | Oneida | WI | A | 37 ft |
| Upper Kaubashine Lake | Oneida | WI | A | 56 ft |
| Rock Lake | Jefferson | WI | A | 60 ft |
| Birch Island Lake | Burnett | WI | A | - |
| Little Crawling Stone Lake | Vilas | WI | A | 44 ft |
| Horseshoe Lake | Barron | WI | A | 19 ft |
| Island Lake | Rusk | WI | A | 54 ft |
Showing 50 of 501 infested lakes.
Frequently Asked Questions
How many lakes have chinese mystery snail?
Chinese Mystery Snail has been documented in 501 lakes, 0 in Minnesota and 501 in Wisconsin.
Does chinese 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 chinese mystery snail should be monitored for changes in water quality over time.
Source: EPA National Aquatic Resource Surveys, 2026.