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

Giant knotweed (Polygonum sachalinense)

Select Another Location:

Total Locations: 18
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: https://dnr.wisconsin.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
WaterbodyStatusWaterbody ID Code (WBIC)CountyDetails
2024 (3)
10th Ave N, 1,100ft N of Hwy 51 intersectionVerified   Details
89215 Bark Point RdVerified   Details
Brownstone Trail behind DNR StationVerified   Details
2023 (1)
Mead Lake KnotweedVerified2143900Clark Details
2022 (4)
Bayview Park Rd, .5mi N of Bayview Beach RdVerified   Details
Old Military Rd and 10th StVerified   Details
Riitenhouse Inn, 50ft W of buildingVerified   Details
West end of Kaseno RdVerified   Details
2021 (8)
10390 W US Hwy 2, 1,545ft E of Sears RdVerified   Details
Dalrymple Park Road, 100ft from Hwy 13Verified   Details
NE Side of Cornucopia Fire Dept BuildingVerified   Details
S 4th St on E side, 150ft S of Rittenhouse AveVerified   Details
Star Rte Rd S side, 1,460ft W of Hwy JVerified   Details
W Bigelow St S side, 185ft W of 10th AveVerified   Details
W Side Valley Rd, 1,700ft N of Hwy JVerified   Details
W. Bigelow St. Verified and Vouchered Bayfield Details
2019 (1)
Old Indian Trail at County Highway F
2014 (1)
S. of Washington Ave & E. of 1st Street Verified Bayfield 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].