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Lake Koshkonong

Lake Koshkonong
Photo by Wisconsin DNR

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

Rock River-Koshkonong Association [exit DNR]

Rock-Koshkonong Lake District [exit DNR]

Find A Lake > Jefferson County > Lake Koshkonong

Lake Koshkonong
Jefferson, Dane, Rock County, 10595 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 75 (Hypereutrophic) and was determined using Secchi data. For a Shallow Lowland lake, this is considered Poor. Shallow Lowland lakes do not stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.

Lake Koshkonong has been monitored by volunteers since 2001. Volunteers monitor water clarity with a black and white Secchi disk. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. Lake Koshkonong 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. 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
Lake Koshkonong - Crescent Bay10043770Map2015Details
Lake Koshkonong - Deep Hole Off South Shore283119Map2019Details
Lake Koshkonong - Middle Of Lake543266Map2006Details
Lake Koshkonong - N of Charley Bluff landing10022780Map2019Details
Rock River at Lake Koshkonong082Map1976Details