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Rock Lake from Tyranena Park 2

Rock Lake from Tyranena Park 2
Photo by Ashley Beranek

Contact information
For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
Division of Water
Bureau of Water Quality
DNR Contacts for Rock Lake

Rock Lake Improvement Association [exit DNR]

Find A Lake > Jefferson County > Rock Lake

Rock Lake
Jefferson County, 1365 Acres

Invasive Species

SpeciesStatusYear FoundDetails
Banded Mystery SnailVerified2015Details
Chinese Mystery SnailVerified2005Details
Curly-Leaf PondweedVerified and Vouchered1969Details
Eurasian Water-MilfoilVerified and Vouchered1990Details
Hybrid Eurasian / Northern Water-MilfoilVerified and Vouchered1990Details
Yellow IrisVerified2015Details
Zebra MusselVerified2005Details

* 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.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.].