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

Japanese knotweed (Fallopia japonica)

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Total Locations: 327
Total Lakes and Rivers: 64 *

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 12
WaterbodyStatusWaterbody ID Code (WBIC)CountyDetails
2023 (5)
650th StreetVerified Dunn Details
Knotweed - Wolff St & Michigan BoulevardVerified   Details
Michigan Blvd - L. Michigan ShorelineVerified20  Details
Michigan Blvd & Yout Street - L. MichiganShorelineVerified20  Details
Sand Creek COOP KnotweedVerified and Vouchered Dunn Details
2022 (11)
101th Ave. Cedar Lk inlet. ROWVerified and Vouchered Polk Details
1188 Nova Ln Green Bay, WI 54304 Verified Brown Details
504 N 5th Ave Sturgeon Bay, WI 54235Verified Door Details
Badger Boat LandingVerified Waushara Details
Cty Rd PPVerified and Vouchered Polk Details
Green Tree Rd Japanese Knotweed Verified Milwaukee Details
j. KnotweedVerified Manitowoc Details
J. Knotweed Firelane 4Verified Calumet Details
Riverside Blvd-Apple River ParkVerified and Vouchered   Details
US HWY 12 - 500 M East of Whitney WayVerified Dane Details
West Wisconsin Ave Japanese Knotweed Verified Milwaukee Details
2021 (24)
County MM (Station ID# 10055315)
Dairyland DriveVerified Sheboygan Details
E. of S. Main St. and N. of Washington St. Verified Portage Details
E. of South Main Street Verified Portage Details
Elm Avenue - HillsboroVerified Vernon Details
Hennepin Place; North Bay, WIVerified Racine Details
Illinois Avenue - Wisconsin DellsVerified Columbia Details
Martin Ave and N 15th stVerified Sheboygan Details
Mill Race DriveVerified Sauk Details
Pavelski Road Verified Portage Details
Scout Hall Park Verified Portage 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].