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

Lakes and Rivers With Invasives - 2020 Findings

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Total Locations: 243
Total Lakes and Rivers: 106 *

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)Details
Ashland County (6)
Across from Super 8 on Hwy 2Purple LoosestrifeVerified  Details
Butternut LakeYellow IrisVerified and Vouchered2283300 Details
Loon LakePurple LoosestrifeVerified2767300 Details
Meder LakePurple LoosestrifeVerified2935300 Details
Memorial Park - behind Chequamegon HotelPurple LoosestrifeVerified  Details
SE side of Hwy 13 and Hwy C intersectionPurple LoosestrifeVerified  Details
Barron County (1)
Skinaway Lake Chinese Mystery SnailVerified and Vouchered2497300 Details
Bayfield County (7)
Bark Bay Slough Queen of the meadow (Filipendula ulmaria)Verified and Vouchered2881000 Details
Fish Creek Slough PLPurple LoosestrifeVerified  Details
Non-Native Phrage Lake OwenPhragmites (non-native)Verified and Vouchered2900200 Details
Non-Native Phragmites Lake OwenPhragmites (non-native)Verified and Vouchered  Details
PL Wetland Ditch Washburn, WIPurple LoosestrifeVerified  Details
Yellow Iris Mill PondYellow IrisVerified2876000 Details
YFI Buskey Bay 2020Yellow IrisVerified2903900 Details
Brown County (15)
East River - AOI-IBI mile 1Phragmites (non-native)Verified118000 Details
East River - Harold Lewis TrailPhragmites (non-native)Verified118000 Details
East River Mile 1Purple LoosestrifeVerified118000 Details
East River Trail near Amy st. and John st.Purple LoosestrifeVerified  Details
Green Bay and Fox River AOCZebra MusselVerified117900 Details
Green Bay and Fox River AOCChinese Mystery SnailVerified117900 Details
Green Bay and Fox River AOCPhragmites (non-native)Verified117900 Details
Green Bay and Fox River AOCPurple LoosestrifeVerified117900 Details
Green Bay and Fox River AOCEurasian Water-MilfoilVerified117900 Details
Green Bay and Fox River AOCCurly-Leaf PondweedVerified117900 Details
Intersection of Appian Way and Deckner AvenueJapanese knotweed (Fallopia japonica)Verified  Details
JK AOI-IBI East River Mile 1Japanese knotweed (Fallopia japonica)Verified118000 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].