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Lac Courte Oreilles
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 39 (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 Name | Station ID | Map | Max Year | Reports |
|---|
| La Cor Nearshore No Cent Bay | 583078 | Map | 1996 | Details |
| La Cor Nearshore Nr Ring Cr | 583079 | Map | 1996 | Details |
| La Cor Nearshore Nr Sec 32 Trb | 583082 | Map | 1996 | Details |
| La Cor Nearshore Nr Whifsh Cr | 583081 | Map | 2019 | Details |
| La Cor Nearshore Se Musky By | 583080 | Map | 1996 | Details |
| Lac Court Oreilles - Musky Bay | 583068 | Map | 2009 | Details |
| Lac Court Oreilles - Outlet | 583077 | Map | 2023 | Details |
| Lac Courte Oreilles - Anchor Bay / Grindstone Creek (LCO-5) | 583071 | Map | 2023 | Details |
| Lac Courte Oreilles - Barbertown Bay/ NE Bay (LCO-6) | 10033392 | Map | 2023 | Details |
| Lac Courte Oreilles - Center (P9) | 10033394 | Map | 2010 | Details |
| Lac Courte Oreilles - Center Basin (Site C / LCO-3) | 583067 | Map | 2023 | Details |
| Lac Courte Oreilles - Center Northeast Bay | 583072 | Map | 2023 | Details |
| Lac Courte Oreilles - Central - West (P1) | 10033387 | Map | 2010 | Details |
| Lac Courte Oreilles - Central South (P4) | 10033390 | Map | 2010 | Details |
| Lac Courte Oreilles - Chicago Bay | 10039052 | Map | 2003 | Details |
| Lac Courte Oreilles - Deep Hole (LCO-4) | 583046 | Map | 2024 | Details |
| Lac Courte Oreilles - East (P5) | 10033391 | Map | 2010 | Details |
| Lac Courte Oreilles - East - North (P8) | 10033393 | Map | 2010 | Details |
| Lac Courte Oreilles - East - South (P6) | 10033442 | Map | 2010 | Details |
| Lac Courte Oreilles - Musky Bay (MB-1) | 10033577 | Map | 2023 | Details |
| Lac Courte Oreilles - Musky Bay East Cranberry Outlet (MB-2) | 10038981 | Map | 2023 | Details |
| Lac Courte Oreilles - Musky Bay North Shoreline (MB-4) | 10038983 | Map | 2023 | Details |
| Lac Courte Oreilles - Musky Bay West Cranberry Outlet (MB-2A) | 10038982 | Map | 2023 | Details |
| Lac Courte Oreilles - Musky Bay West of Deep Hole (MB-A) | 10038984 | Map | 2013 | Details |
| Lac Courte Oreilles - Musky Bay-Entrance 12 Feet (MB-B) | 10037854 | Map | 2021 | Details |
| Lac Courte Oreilles - Musky Bay-Entrance 30 feet (MB-C) | 10037855 | Map | 2021 | Details |
| Lac Courte Oreilles - Near KK Bridge | 583137 | Map | 2005 | Details |
| Lac Courte Oreilles - Near Stuckey Bay (C-2) | 583069 | Map | 2005 | Details |
| Lac Courte Oreilles - North Central Bay | 583070 | Map | 2001 | Details |
| Lac Courte Oreilles - Stuckey Bay Cranberry Outlet (LCO-1A) | 10038985 | Map | 2023 | Details |
| Lac Courte Oreilles - Stuckey Bay Deep Hole (LCO-1) | 583097 | Map | 2024 | Details |
| Lac Courte Oreilles - West - North (P2) | 10033388 | Map | 2010 | Details |
| Lac Courte Oreilles - West - West (P3) | 10033389 | Map | 2010 | Details |
| Lac Courte Oreilles - West Basin (LCO-2B) | 10044724 | Map | 2023 | Details |
| Lac Courte Oreilles - West Basin - Deep Hole (Site B/LCO-2) | 583066 | Map | 2023 | Details |
| Lac Courte Oreilles Trib - Sec 32 | 583076 | Map | 1996 | Details |