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DNR Contacts for Delavan Lake

Delavan Lake Improvement Association [exit DNR]

Delavan Lake Sanitary District [exit DNR]

Town Of Delavan Lake Commission [exit DNR]

Find A Lake > Walworth County > Delavan Lake

Delavan Lake
Walworth County, 1906 Acres

Invasive Species

SpeciesStatusYear FoundDetails
Banded Mystery SnailVerified and Vouchered2012Details
Curly-Leaf PondweedVerified and Vouchered1975Details
Eurasian Water-MilfoilVerified and Vouchered1995Details
Hybrid Eurasian / Northern Water-MilfoilVerified2014Details
Ornamental water lilies (non-native Nymphaea sp.) Verified2010Details
Phragmites (non-native)Verified2014Details
Purple LoosestrifeVerified and Vouchered2014Details
Rusty Crayfish*Observed2014Details
Yellow Floating HeartVerified2008Details
Zebra MusselVerified and Vouchered1999Details

* About Invasive Species: 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: http://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.].