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

Delavan Lake -- Access Off State Hwy 50

Location:

Delavan Lake has the following aquatic invasive species:
Banded Mystery Snail, Curly-Leaf Pondweed, Eurasian Water-Milfoil, Hybrid Eurasian / Northern Water-Milfoil, Ornamental water lilies (non-native Nymphaea sp.), Pennywort, Phragmites (non-native), Purple Loosestrife, Zebra Mussel To Excel
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DatePrior WaterbodyCountyWBICKnown Aquatic Invasive Species
07/20/2025Browns LakeRacine County0Information Not Available
07/13/2025Potters LakeWalworth County0Information Not Available
07/07/2025Turtle lakeWalworth County0Information Not Available
06/28/2025PewaukeeWaukesha County0Information Not Available
06/28/2025Lake AndreaKenosha County0Information Not Available
06/26/2025ComoWalworth County0Information Not Available
06/26/2025Big Green LakeGreen Lake County0Information Not Available
06/24/2025Oconomowoc LakeWaukesha County0Information Not Available
06/24/2025Eagle RiverFlorence County0Information Not Available
06/15/2025Olson Lakex-Illinois0Information Not Available
06/15/2025Lake GenevaWalworth County0Information Not Available
06/15/2025Chain of Lakesx-Illinois0Information Not Available
06/14/2025LauderdaleWalworth County0Information Not Available
06/12/2025Fox Lakex-Illinois0Information Not Available
06/12/2025Potters LakeWalworth County0Information Not Available
06/12/2025LauderdaleWalworth County0Information Not Available
06/08/2025Petenwell FlowageAdams County0Information Not Available
06/07/2025TichiganRacine County0Information Not Available
06/07/2025Lake GenevaWalworth County0Information Not Available
06/06/2025MendotaDane County0Information Not Available
05/25/2025Lake GenevaWalworth County0Information Not Available
05/25/2025Lake ElizabethKenosha County0Information Not Available
05/24/2025Lake WaubesaDane County0Information Not Available
05/24/2025Geneva LakeWalworth County0Information Not Available
05/17/2025Mississippi RiverLa Crosse County0Information Not Available
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