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 - 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: 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
WaterbodySpeciesStatusWaterbody ID Code (WBIC)Details
Ashland County (1)
S. of Main St. & E. of W. 12th Ave Bohemian knotweed (Polygonum bohemicum)Verified and Vouchered  Details
Bayfield County (1)
Cable Lake Yellow IrisVerified2729700 Details
Brown County (8)
Little Tail PointStarry StonewortVerified and Vouchered  Details
Little Tail Point Interior - Unnamed Stream 3000549 Coastal WetlandsEuropean FrogbitVerified and Vouchered  Details
Long Tail PointEuropean FrogbitVerified and Vouchered  Details
Manure pit, private property, Town of Scott Round GobyNo Longer Observed  Details
Sensiba Unit Exterior Ponds - SouthEuropean FrogbitVerified and Vouchered  Details
Suamico RiverEuropean FrogbitVerified and Vouchered410900 Details
Unnamed Stream 3000552European FrogbitVerified  Details
Unnamed Stream 3000555 (Lineville Rd)European FrogbitVerified3000555 Details
Chippewa County (2)
Trout Creek-CLPCurly-Leaf PondweedVerified5530685 Details
Trout Creek-RCRusty CrayfishVerified5530685 Details
Clark County (1)
Mead Lake KnotweedGiant knotweed (Polygonum sachalinense)Verified2143900 Details
Dodge County (2)
Horicon Marsh - Old Marsh Road DikePurple LoosestrifeVerified869500 Details
Horicon Marsh at Stroak'S Ditch H MarPurple LoosestrifeVerified861300 Details
Door County (2)
Rileys Bay Street Access - Rileys Bay RdPurple LoosestrifeVerified  Details
Sun N' Surf Road-UnionPurple LoosestrifeVerified  Details
Dunn County (4)
650th StreetJapanese knotweed (Fallopia japonica)Verified  Details
Sand Creek COOP KnotweedJapanese knotweed (Fallopia japonica)Verified and Vouchered  Details
Trout Creek-CLPCurly-Leaf PondweedVerified5530685 Details
Trout Creek-RCRusty CrayfishVerified5530685 Details
Forest County (1)
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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].