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
09/12/2026Geneva LakeWalworth County0Information Not Available
09/05/2026Geneva LakeWalworth County0Information Not Available
08/06/2026Kegonsa LakeDane County0Information Not Available
08/06/2026Rock LakeJefferson County0Information Not Available
08/04/2026Geneva LakeWalworth County0Information Not Available
07/29/2026Geneva LakeWalworth County0Information Not Available
07/29/2026Chain o lakesx-Illinois0Information Not Available
07/29/2026Rock LakeJefferson County0Information Not Available
07/28/2026Hunter LakeWaukesha County0Information Not Available
07/28/2026Chain o Lakesx-Illinois0Information Not Available
07/26/2026Lake MinonaDane County0Information Not Available
07/26/2026Whitewater LakeWalworth County0Information Not Available
07/25/2026Storrs LakeWalworth County0Information Not Available
07/25/2026Lake Minearx-Illinois0Information Not Available
07/19/2026Pewaukee LakeWaukesha County0Information Not Available
07/19/2026Geneva LakeWalworth County0Information Not Available
07/12/2026Paddock LakeKenosha County0Information Not Available
07/12/2026Eagle LakeWalworth County0Information Not Available
06/27/2026Crystal Lake, Illinois 0Information Not Available
06/20/2026Pierce LakeWinnebago County0Information Not Available
06/06/2026Lake KoshkonongRock County0Information Not Available
06/06/2026Lake RipleyDane County0Information Not Available
05/30/2026Elkhart LakeSheboygan County0Information Not Available
05/25/2026Whitewater LakeWalworth County0Information Not Available
05/25/2026Storry LakeRock County0Information Not Available
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