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
Page 1 of 12
WaterbodyStatusWaterbody ID Code (WBIC)Year First FoundDetails
Adams County (3)
Big Roche A Cri LakeVerified13748002012 Details
Co Hwy Z, S. of Hwy 21Verified 2019 Details
Mason LakeVerified1757002009 Details
Bayfield County (1)
Long LakeVerified27671002017 Details
Brown County (5)
Intersection of Appian Way and Deckner AvenueVerified 2020 Details
JK AOI-IBI East River Mile 1Verified1180002020 Details
JK AOI-IBI East River Mile 2Verified1180002020 Details
JK East River at Harold Lewis Trail off Main StreetVerified1180002020 Details
Thornberry Creek - 15m Upstream Of Forest DriveVerified and Vouchered4100502015 Details
Burnett County (2)
Tabor LakeVerified26717002021 Details
Yellow LakeVerified26752002010 Details
Calumet County (10)
Hwy 151 (Brothertown) 500 Ft North County Rd H
Hwy 151 (South Brothertown) 1/2 Mile South of County Rd H
Clay Street 700 ft. east of Adams StreetVerified 2018 Details
County Road K 650 ft. west of Jodar Drive
High Street (Chilton) across from North Water streetVerified 2018 Details
Lake Shore Dr (Stockbridge) 2000 Ft North Lake StVerified 2018 Details
Lake Shore Dr 700 Ft North of County Rd EE (Stockbridge)
Lime Kiln Rd High Cliff State ParkVerified 2018 Details
Long road 450 ft south of Hickory Hills RoadVerified 2018 Details
Spring Creek, Main St and HornVerified 2015 Details
Chippewa County (7)
Corner of 245th Ave & 137th St.Verified and Vouchered 2018 Details
Corner of E. Park Ave and Co Road X Verified and Vouchered   Details
E. Park Ave., E. of Co Hwy X Verified and Vouchered 2018 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].