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For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
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DNR Contacts for Lac Courte Oreilles

Lac Courte Oreilles Lakes Association Inc (Cola) [exit DNR]

Find A Lake > Sawyer County > Lac Courte Oreilles

Lac Courte Oreilles
Sawyer County, 5139 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 40 (Oligotrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Excellent.

Lac Courte Oreilles has been monitored by volunteers since 1991. 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. Lac Courte Oreilles 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
La Cor Nearshore No Cent Bay583078Map1996Details
La Cor Nearshore Nr Ring Cr583079Map1996Details
La Cor Nearshore Nr Sec 32 Trb583082Map1996Details
La Cor Nearshore Nr Whifsh Cr583081Map1996Details
La Cor Nearshore Se Musky By583080Map1996Details
Lac Court Oreilles - Musky Bay583068Map2009Details
Lac Court Oreilles - Outlet583077Map2018Details
Lac Courte Oreilles - Anchor Bay / Grindstone Creek (LCO-5)583071Map2018Details
Lac Courte Oreilles - Barbertown Bay/ NE Bay (LCO-6)10033392Map2018Details
Lac Courte Oreilles - Center (P9)10033394Map2010Details
Lac Courte Oreilles - Center Basin (Site C / LCO-3)583067Map2019Details
Lac Courte Oreilles - Center Northeast Bay583072Map2019Details
Lac Courte Oreilles - Central - West (P1)10033387Map2010Details
Lac Courte Oreilles - Central South (P4)10033390Map2010Details
Lac Courte Oreilles - Chicago Bay10039052Map2003Details
Lac Courte Oreilles - Deep Hole (LCO-4)583046Map2019Details
Lac Courte Oreilles - East (P5)10033391Map2010Details
Lac Courte Oreilles - East - North (P8)10033393Map2010Details
Lac Courte Oreilles - East - South (P6)10033442Map2010Details
Lac Courte Oreilles - Musky Bay (MB-1)10033577Map2019Details
Lac Courte Oreilles - Musky Bay East Cranberry Outlet (MB-2)10038981Map2018Details
Lac Courte Oreilles - Musky Bay North Shoreline (MB-4)10038983Map2018Details
Lac Courte Oreilles - Musky Bay West Cranberry Outlet (MB-2A)10038982Map2018Details
Lac Courte Oreilles - Musky Bay West of Deep Hole (MB-A)10038984Map2013Details
Lac Courte Oreilles - Musky Bay-Entrance 12 Feet (MB-B)10037854Map2019Details
Lac Courte Oreilles - Musky Bay-Entrance 30 feet (MB-C)10037855Map2019Details
Lac Courte Oreilles - Near KK Bridge583137Map2005Details
Lac Courte Oreilles - Near Stuckey Bay (C-2)583069Map2005Details
Lac Courte Oreilles - North Central Bay583070Map2001Details
Lac Courte Oreilles - Stuckey Bay Cranberry Outlet (LCO-1A)10038985Map2018Details
Lac Courte Oreilles - Stuckey Bay Deep Hole (LCO-1)583097Map2019Details
Lac Courte Oreilles - West - North (P2)10033388Map2010Details
Lac Courte Oreilles - West - West (P3)10033389Map2010Details
Lac Courte Oreilles - West Basin (LCO-2B)10044724Map2018Details
Lac Courte Oreilles - West Basin - Deep Hole (Site B/LCO-2)583066Map2019Details
Lac Courte Oreilles Trib - Sec 32583076Map1996Details