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

Bohemian knotweed (Polygonum bohemicum)

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Total Locations: 21
Total Lakes and Rivers: 2 *

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
WaterbodyStatusWaterbody ID Code (WBIC)Year First FoundDetails
Adams County (1)
River Road - Wisconsin DellsVerified 2019 Details
Ashland County (1)
S. of Main St. & E. of W. 12th Ave Verified and Vouchered 2023 Details
Dane County (3)
Campus Drive near Paunack PlaceVerified 2019 Details
Fish Hatchery Road across from WalgreensVerified 2019 Details
Lake Wingra Wetland Area off Edgewood DriveVerified 2019 Details
Jefferson County (1)
Veterans Lane - 150 Meters S of Mill Pond AccessVerified 2019 Details
Polk County (8)
203rd St ROWVerified and Vouchered   Details
Cty Rd C. ROWVerified and Vouchered 2022 Details
Cty Rd G. ROWVerified and Vouchered 2022 Details
Cty Rd M N of Horse CreekVerified and Vouchered 2022 Details
Cty Rd O ROWVerified and Vouchered 2022 Details
Cty Rd WVerified and Vouchered 2022 Details
Cty Rd W ROWVerified and Vouchered 2022 Details
Frederic Storage SiteVerified and Vouchered 2022 Details
Sheboygan County (3)
County Hwy MM
Huson ParkVerified 2021 Details
Mill CreekVerified 2021 Details
Walworth County (2)
Hybrid KnotweedVerified 2022 Details
NE corner of US-12 and WI-59Verified 2019 Details
Washington County (1)
Newburg residence along MKE RiverVerified150002023 Details
Waukesha County (1)
Hybrid KnotweedVerified 2019 Details

* 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].