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

Hybrid Eurasian / Northern Water-Milfoil

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Total Locations: 182
Total Lakes and Rivers: 231 *

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
Page 1 of 8
WaterbodyStatusWaterbody ID Code (WBIC)CountyDetails
2023 (2)
Lake Five Verified   Details
Rainbow Spring LakeVerified768000Waukesha Details
2022 (5)
Arbutus LakeVerified181400Forest Details
Cedar LakeVerified45100Manitowoc Details
Lucas LakeVerified and Vouchered35900Washington Details
Pearl LakeVerified195400Waushara Details
Round Lake Verified and Vouchered2395600Sawyer Details
2021 (2)
Dutch Hollow LakeVerified1286500Sauk Details
Gilbert LakeVerified186400Waushara Details
2020 (1)
Blue LakeVerified and Vouchered1538600Oneida Details
2019 (8)
Bahr LakeVerified325300Shawano Details
Eagle Spring LakeVerified768600Waukesha Details
HWM Trego LakeVerified2712000Washburn Details
Lower Nemahbin LakeVerified827000Waukesha Details
Lulu LakeVerified768800Walworth Details
Peshtigo Flowage (Marinette County)Verified515800Marinette Details
Round LakeVerified446700Oconto Details
Sandstone FlowageVerified531300Marinette Details
2018 (6)
Bass LakeVerified584200Florence Details
Coleman LakeVerified632800Marinette Details
Little Horn LakeVerified466800Oconto Details
Rice Lake Verified2103900Barron Details
Roberts LakeVerified378400Forest Details
Ucil LakeVerified455400Oconto 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].