Find A Lake > Vilas County > Twin Lakes (South)
Twin Lakes (South)
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 36 (Oligotrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Excellent.
Twin Lakes (South) has been monitored by volunteers since 1993. 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. Additional monitoring has been done through projects funded in part by DNR 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 |
|---|
| North Twin Lake - Herbicide Monitoring Site NT5 | 10048319 | Map | 2017 | Details |
| South Twin Lake - Deep Hole | 643106 | Map | 2023 | Details |
| South Twin Lake - N (Herbicide Monitoring Site 3) | 10044687 | Map | 2016 | Details |
| South Twin Lake - NE (Herbicide Monitoring Site 1) | 10044685 | Map | 2016 | Details |
| South Twin Lake - ST-2 | 10057506 | Map | 2023 | Details |
| South Twin Lake - ST-3 | 10057507 | Map | 2023 | Details |
| South Twin Lake - ST6 (Application Area Y-21) | 10055087 | Map | 2021 | Details |
| South Twin Lake - ST7 (Application Area X-21) | 10055088 | Map | 2021 | Details |
| South Twin Lake - ST8 (Untreated, Northwest End of Lake) | 10055090 | Map | 2021 | Details |
| South Twin Lake - SW (Herbicide Monitoring Site 2) | 10044686 | Map | 2021 | Details |