Find A Lake > Sawyer County > Birch Lake
Sawyer, Washburn County, 364 Acres
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 59 (Eutrophic) and was determined using satellite water clarity observations data. For a Deep Lowland lake, this is considered Fair. Deep Lowland lakes stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.
Birch Lake has been monitored by volunteers since 1995. 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 Name||Station ID||Map||Max Year||Reports|
|Birch Lake - Deep Hole||583094||Map||2019||Details|
|Birch Lake at CTY F Bridge||10048295||Map||2019||Details|