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DNR Contacts for Lake Onalaska

Onalaska Lake P & R District [exit DNR]

Find A Lake > La Crosse County > Lake Onalaska

Lake Onalaska

Invasive Species

SpeciesStatusYear FoundDetails
Curly-Leaf PondweedVerified and Vouchered1956Details
Eurasian Water-MilfoilVerified and Vouchered1976Details
Faucet SnailVerified2015Details
Hybrid Eurasian / Northern Water-MilfoilVerified2007Details
Purple LoosestrifeVerified2016Details
Water HyacinthVerified and Vouchered2015Details
Water LettuceVerified2015Details
Yellow IrisVerified2016Details

* 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: 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.].