Contact information
For information on Lakes in Wisconsin, contact:
DNR Lake
Division of Water
Bureau of Water Quality
Aquatic Invasive Species Contacts

Lakes and Rivers With Invasives - 2023 Findings

Select Another Location:

Total Locations: 188
Total Lakes and Rivers: 212 *

Disclaimer: Aquatic invasive species (AIS) records are assigned statuses of "verified", "observed", or "no longer observed" based on AIS Status Guidance. In general, "verified" populations are established and have been verified by a taxonomic expert. Populations with the "observed" status have not been verified by a taxonomic expert or do not have established populations. Populations with the "no longer observed" status include populations where a reproducing population did not establish. Our inventories are not necessarily exhaustive so it is important to report occurrences. To report new discoveries visit: See the Aquatic Invasive Species Guidance for information on how statuses are assigned. Personally identifiable information on data collection forms may be provided to requesters to the extent required by Wisconsin's Open Records Law [ss. 19.31-19.39, Wis. Stats.].

By County | By Waterbody | By Species | By Year | Open In Excel
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WaterbodySpeciesStatusWaterbody ID Code (WBIC)CountyDetails
0.1 Mile E of Quill Lake. Along Tree Farm RoadPhragmites (non-native)Verified   Details
650th StreetJapanese knotweed (Fallopia japonica)Verified Dunn Details
Alford Dr Park and Ride S of CarthagePurple LoosestrifeVerified Kenosha Details
Amy Belle LakeEurasian Water-MilfoilVerified828650Washington Details
Ashippun River inlet to Druid LakePurple LoosestrifeVerified Washington Details
Barkhousen Interpretive CenterPurple LoosestrifeVerified   Details
Barkhousen Interpretive CenterPhragmites (non-native)Verified   Details
Bass Lake (Rhinelander) Eurasian Water-MilfoilVerified and Vouchered1580300Oneida Details
Bay shore from University to Seagull Bar SNAEuropean FrogbitVerified20  Details
Belfast Lane and W Belfast LanePurple LoosestrifeVerified   Details
Big Blake LakeBanded Mystery SnailVerified2627000Polk Details
Big Cedar LakeStarry StonewortVerified and Vouchered25300Washington Details
Big MuskegoSpiny NaiadVerified762400Waukesha Details
Big Portage Lake Chinese Mystery SnailVerified and Vouchered1629500Vilas Details
Blass LakeEurasian Water-MilfoilVerified   Details
Bluff Creek at state land off Whitewater Creek RdPurple LoosestrifeVerified Walworth Details
Bradley LakeCurly-Leaf PondweedVerified   Details
Bradley LakePhragmites (non-native)Verified   Details
Brown Deer Park PondBanded Mystery SnailVerified   Details
Brown Deer Park PondCurly-Leaf PondweedVerified   Details
Butternut Creek @ CTY NChinese Mystery SnailVerified5518714Polk Details
Butternut LakeChinese Mystery SnailVerified692400Forest Details
Cable Lake Yellow IrisVerified2729700Bayfield Details
Canal East of Johnson RdEuropean FrogbitVerified   Details
Casco CreekRusty CrayfishVerified   Details
Case Eagle Park - FRFlowering RushVerified   Details
Cemetery RD JKWJapanese knotweed (Fallopia japonica)Verified   Details
Chain Lake CMSChinese Mystery SnailVerified2350500Chippewa, Rusk Details
Church Pine LakeYellow IrisVerified2616100Polk Details
City Park DitchEuropean FrogbitVerified   Details
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* Total Lakes and Rivers = total unique Waterbody ID Codes (WBICs). If a waterbody, such as a small pond not in the DNR 24 K Hydrolayer, doesn't have a WBIC, it isn't currently counted in the total.

** Purple Loosestrife - DNR has only a partial list of locations. For more extensive data, visit the Great Lakes Indian and Fish Wildlife Commission (GLIFWC) website [exit DNR].

** Fish species - This web page only has a partial list of locations. For more extensive data, visit the Wisconsin Department of Natural Resources Map of Distribution of WI Fish Species [exit DNR].