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

Lakes and Rivers With Invasives - 2023 Findings

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Total Locations: 162
Total Lakes and Rivers: 152 *

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
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WaterbodyStatusWaterbody ID Code (WBIC)CountyDetails
Asiatic Clam (Corbicula) (2)
North Branch Nippersink Creek - Veteran's ParkVerified742700Walworth Details
Sugar River - Downstream of Albany DamVerified875300Green Details
Banded Mystery Snail (3)
Big Blake LakeVerified   Details
Lake MohawksinVerified and Vouchered1515400Lincoln Details
Spider Lake Verified2435700Sawyer Details
Bohemian knotweed (Polygonum bohemicum) (2)
Newburg residence along MKE RiverVerified15000Washington Details
S. of Main St. & E. of W. 12th Ave Verified and Vouchered Ashland Details
Chinese Mystery Snail (10)
Big Portage Lake Verified and Vouchered   Details
Butternut Creek @ CTY NVerified5518714Polk Details
Butternut LakeVerified   Details
Chain Lake CMSVerified   Details
Lake MohawksinVerified and Vouchered1515400Lincoln Details
Lake Montanis CMSVerified   Details
Lake Noquebay Upper InletVerified   Details
Little Butternut Lake CMSVerified   Details
McCann Lake CMSVerified   Details
Oconomowoc River between Oconomowoc and Fowler LakesVerified848200Waukesha Details
Curly-Leaf Pondweed (6)
Elton CreekVerified   Details
Gilbert LakeVerified and Vouchered   Details
Pine CreekVerified   Details
Silver LakeVerified and Vouchered   Details
Trout Creek-CLPVerified5530685Chippewa, Dunn Details
Vance Lake Verified and Vouchered2327300Vilas Details
Eurasian Water-Milfoil (14)
Amy Belle LakeVerified   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].