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

Eurasian Water-Milfoil

Select Another Location:

Total Locations: 1147
Total Lakes and Rivers: 1006 *

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: https://dnr.wisconsin.gov/topic/Invasives/report.html. 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
Page 1 of 41
WaterbodySpeciesStatusWaterbody ID Code (WBIC)CountyDetails
2025 (1)
Balsam Lake EWM/HWMEurasian Water-MilfoilVerified   Details
2024 (29)
Bass LakeHybrid Eurasian / Northern Water-MilfoilVerified417900Oconto Details
Big Bass EWMEurasian Water-MilfoilVerified1405200Marathon Details
Carrol Lake Eurasian Water-MilfoilVerified1544800Oneida, Vilas Details
Crystal LakeHybrid Eurasian / Northern Water-MilfoilVerified45200Sheboygan Details
Curtis LakeEurasian Water-MilfoilVerified1266800Columbia Details
EWM_Milwaukee_07092024_LMR at Villard Ave_17600Eurasian Water-MilfoilVerified17600Milwaukee Details
Fawn Lake (Manitowish Chain)Eurasian Water-MilfoilVerified and Vouchered2328900Vilas Details
Fox River - Miller Park On the FoxEurasian Water-MilfoilVerified117900Winnebago Details
Grand Portage LakeEurasian Water-MilfoilVerified and Vouchered2314200Iron Details
Green Lake Hybrid Eurasian / Northern Water-MilfoilVerified28100Washington Details
Howard Quarry Eurasian Water-MilfoilVerified Brown Details
Johns LakeHybrid Eurasian / Northern Water-MilfoilVerified245800Waushara Details
Lake LucerneEurasian Water-MilfoilVerified396500Forest Details
Little Star Lake (Manitowish Chain)Eurasian Water-MilfoilVerified and Vouchered2334300Vilas Details
Manitowish River (Manitowish Chain)Eurasian Water-MilfoilVerified and Vouchered2324400Vilas Details
North Branch Oconto RiverEurasian Water-MilfoilVerified457800Oconto Details
Ox Creek at County Road ZZ
Ox Creek at Hwy ZZHybrid Eurasian / Northern Water-MilfoilVerified168600Marquette Details
Peters LakeHybrid Eurasian / Northern Water-MilfoilVerified741400Walworth Details
Rock Creek Eurasian Water-MilfoilVerified5035411Jefferson Details
Rock River Landing Park - Elizabeth Ave.Eurasian Water-MilfoilVerified788800Jefferson Details
Round LakeEurasian Water-MilfoilVerified68600Calumet Details
Round Lake EWMEurasian Water-MilfoilVerified2494000Polk Details
Spider Lake (Manitowish Chain)Eurasian Water-MilfoilVerified and Vouchered2329500Vilas Details
Stone Lake (Manitowish Chain)Eurasian Water-MilfoilVerified and Vouchered2328800Vilas Details
Tiger Cat Flowage Eurasian Water-MilfoilVerified and Vouchered2435000Sawyer Details
Vern Wolf LakeHybrid Eurasian / Northern Water-MilfoilVerified739100Kenosha 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].