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

Japanese knotweed (Fallopia japonica)

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Total Locations: 300
Total Lakes and Rivers: 63 *

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.wi.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)CountyYear First FoundDetails
Japanese knotweed (Fallopia japonica) (300)
CTH E on East Side of Eagle Spring Lake Verified Waukesha2009 Details
Hwy 151 (Brothertown) 500 Ft North County Rd H
Hwy 151 (South Brothertown) 1/2 Mile South of County Rd H
Kickapoo River - N of HWY 131Verified1182400Crawford2015 Details
15m SE of East Ann St and Division StVerified889100Lafayette2018 Details
22nd Ave 1/2 mile North of County Rd YY
4th street (Oshkosh)Verified Winnebago2018 Details
Alpine LakeVerified245650Waushara2013 Details
Amherst MillpondVerified and Vouchered268200Portage2013 Details
Apple Tree Lane 1200 ft. east of Churchill StreetVerified Waupaca2018 Details
Badfish Creek - North Riley RoadVerified799500Rock2008 Details
Balsam LakeVerified and Vouchered2620600Polk2014 Details
Bean City Road 1000 ft North of Burns RdVerified Waupaca2018 Details
Big Roche A Cri LakeVerified1374800Adams2012 Details
Bishop BranchVerified Vernon2015 Details
Bishop BranchVerified and Vouchered1188500Vernon2012 Details
Bishop Branch - Bishop BranchVerified5030251Vernon2015 Details
Bostwick Creek (Downstream of Co Rd O) Verified and Vouchered La Crosse2018 Details
Burns Road 250 ft East of Potters CreekVerified Waupaca2018 Details
Cedar Creek - Near CedarburgVerified21300Ozaukee2009 Details
Cedar Creek - near end of Riveredge DrVerified21300Ozaukee2009 Details
Cedar Lake Verified and Vouchered2615100Polk2020 Details
Chicog LakeVerified Washburn2019 Details
Chicog Lake Verified Washburn2020 Details
Chippewa RiverVerified Eau Claire2015 Details
Claireville Road 600 ft. north of 9th StVerified Winnebago2018 Details
Clarks Millpond @ County Rd AVerified256100Waushara2018 Details
Clay Street 700 ft. east of Adams StreetVerified Calumet2018 Details
Clayton Ave 400 ft North of Smoke Tree RdVerified Winnebago2018 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].