Cranberry 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 57 (Eutrophic) and was determined using chlorophyll data. For a Shallow Lowland lake, this is considered Good. Shallow Lowland lakes do not stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.

Cranberry Lake has been monitored by volunteers since 1992. 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
Cranberry Lake - Deep Hole	643056	Map	1979	Details
Cranberry Lake - Deep Hole	643177	Map	2024	Details
Cranberry Lake - E Bay (Herbicide Monitoring Site 4)	10043498	Map	2015	Details
Cranberry Lake - E Bay middle (Herbicide Monitoring Site 2)	10043496	Map	2015	Details
Cranberry Lake - E Bay middle (Herbicide Monitoring Site 3)	10043497	Map	2015	Details
Cranberry Lake - E Bay near Eagle R (Herbicide Monitoring Site 1)	10043495	Map	2015	Details
Cranberry Lake East Bay Littoral Zone (H 08#1)	10028800	Map	2008	Details
Cranberry Lake East Bay Littoral Zone (H 08#2)	10028801	Map	2008	Details
Cranberry Lake East Bay Littoral Zone (H 08#3)	10028802	Map	2008	Details
Cranberry Lake East Bay Littoral Zone (H 08#4)	10028803	Map	2008	Details
Cranberry Lake East Bay Littoral Zone (H 08#5)	10028804	Map	2008	Details
Cranberry Lake North Of Island (Mid)	10028806	Map	2008	Details
Cranberry Lake South Littoral Zone (F 08 Ta)	10028805	Map	2008	Details