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 11
WaterbodyStatusWaterbody ID Code (WBIC)CountyDetails
2021 (14)
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
Huson ParkVerified Sheboygan Details
Japanese Knotweed - Charles St. Columbus WIVerified Columbia Details
Martin Ave and N 15th stVerified Sheboygan Details
Mill CreekVerified Sheboygan Details
Pavelski Road Verified Portage Details
Scout Hall Park Verified Portage Details
SE of County Hwy-SS
South of Washington St. - Amherst Junction Verified257400Portage Details
Tabor LakeVerified2671700Burnett Details
West of South St. Verified Portage Details
2020 (10)
Cedar Lake Verified and Vouchered2615100Polk Details
Chicog Lake Verified Washburn Details
Frost Woods Beach - Lake MononaVerified Dane Details
Governor's Island - West PointVerified Dane Details
Intersection of Appian Way and Deckner AvenueVerified Brown Details
JK AOI-IBI East River Mile 1Verified118000Brown Details
JK AOI-IBI East River Mile 2Verified118000Brown Details
JK East River at Harold Lewis Trail off Main StreetVerified118000Brown Details
JK Gordon, WIVerified2740700Douglas Details
JK NebagamonVerified Douglas Details
2019 (10)
Chicog LakeVerified Washburn Details
Co Hwy Z, S. of Hwy 21Verified Adams Details
Corner of Wren Court and West Redstone DriveVerified Sauk 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].