Long Lake

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 44 (Mesotrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Good.

Long Lake has been monitored by volunteers since 1989. 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. Long Lake is also part of DNR's long term trend monitoring project. 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
Long Lake - Deep Hole-Center Basin	093123	Map	2024	Details
Long Lake - Deepest Area - Near Dark Lake	10043794	Map	2015	Details
Long Lake - Site 2	999290	Map	1993	Details
Long Lake Center Basin near deep hole	10041754	Map	1994	Details
Sheboygan River - Franklin Impoundment Mid-Channel at N End Of House On W Bank	603443	Map	1999	Details