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

Harmony Grove Lake District [exit DNR]

Lake Wisconsin Alliance

Village Of Merrimac [exit DNR]

Find A Lake > Columbia County > Lake Wisconsin

Lake Wisconsin
Columbia, Sauk County, 7197 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 65 (Eutrophic) and was determined using Secchi data. For a Impounded Flowing Water lake, this is considered Fair.

Lake Wisconsin has been monitored by volunteers since 1993. 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. 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
Lake Wisconsin (Merrimac) - Deep Hole573125Map2019Details
Lake Wisconsin - Gruber'S Grove Bay G03a10017166Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G07b10017167Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G11c10017168Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G15a10017169Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G19c10017170Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G23a10017171Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G27b10017172Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G31b10017173Map2007Details
Lake Wisconsin - Gruber'S Grove Bay G35c10017174Map2007Details
Lake Wisconsin - Harmony Grove Site F10041146Map2001Details
Lake Wisconsin - Just W Of Whalen Grade113077Map2019Details
Lake Wisconsin - Main Channel off Moon Valley10050871Map2019Details
Lake Wisconsin - Near Dam10028976Map2011Details
Lake Wisconsin - Okee Bridge10028900Map2019Details
Lake Wisconsin - SW of Weigand's Bay - Off Pier10042586Map2016Details
Lake Wisconsin - SW of Weigands Bay10031186Map2015Details
Lake Wisconsin - Sticky Bay - Center10029002Map2019Details
Lake Wisconsin - betw. Stoners Bay and Pine Bluff10031184Map2019Details
Lake Wisconsin Columbia Co - Harmony Grove Site D10007590Map2009Details
Lake Wisconsin Columbia Co. - Harmony Grove Site A10007593Map2009Details
Lake Wisconsin Columbia Co. - Harmony Grove Site B10007592Map2012Details
Lake Wisconsin Columbia Co. - Harmony Grove Site C 10007591Map2009Details
Lake Wisconsin Columbia Co. - Harmony Grove Site E10007589Map2011Details
Lake Wisconsin Columbia Co. - No Name Bay10007594Map2005Details
Lake Wisconsin Columbia Co. - Sunset Bay10007596Map2019Details
Lake Wisconsin Columbia Co. - Turtle Bay10007595Map2019Details
Lake Wisconsin Palisade Street Bay10042254Map2018Details
Lake Wisconsin Whalen's Grade10042253Map2019Details
Lake Wisconsin- Okee Bay South (Mouth of Spring Creek)10039885Map2013Details
Wisconsin River - Grubers Grove Bay Lake WIsconsin10029823Map2009Details
Wisconsin River - Grubers Grove Bay Lake Wisconsin10029820Map2009Details
Wisconsin River - Grubers Grove Bay Lake Wisconsin10029821Map2009Details
Wisconsin River - Grubers Grove Bay Lake Wisconsin10029822Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #1910029814Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #2110029815Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #2610029816Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #3310029817Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #3410029818Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #3610029819Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #610029812Map2009Details
Wisconsin River - Grubers Grove Wisconsin River #910029813Map2009Details
Wisconsin River - Lake Wisconsin - Downstream of Merrimac RR Bridge115016Map2012Details