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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


Water Quality

One measure of a lakes health is the trophic state, which relates to the amount of algae in the water. The average summer trophic state for the last 5 years was 43 (Mesotrophic) and was determined using chlorophyll data. For a Deep Lowland lake, this is considered Excellent. Deep Lowland lakes stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.

Rock Lake has been monitored by volunteers since 1988. Volunteers monitor water clarity with a black and white Secchi disk. Some also collect water samples, which are sent to the State Lab of Hygiene to be analyzed. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. Rock Lake is also part of DNR's long term trend monitoring project. Additional monitoring has been done through projects funded in part by DNR Lake Grants and Aquatic Invasive Species Grants. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.

Water Quality Reports and Graphs

Station NameStation IDMapMax YearReports
Rock Lake - Deep Hole283123Map2019Details
Rock Lake - Northern Part Of Lake10042269Map2015Details
Rock Lake - Pier At Cedar Ln.10028912Map2008Details
Rock Lake - Southern Part Of Lake10042270Map2015Details