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For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
Division of Water
Bureau of Water Quality
DNR Contacts for Lake Onalaska

Onalaska Lake P & R District [exit DNR]

Find A Lake > La Crosse County > Lake Onalaska

Lake Onalaska
La Crosse County, 8391 Acres


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 52 (Eutrophic) and was determined using satellite water clarity observations data. For a Shallow Lowland lake, this is considered Excellent. 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.

Lake Onalaska was monitored by volunteers between 1992 and 1997. 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. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.

Water Quality Reports and Graphs

Station NameStation IDMapMax YearReports
Lake Onalaska - Brice Prairie Channel 1/4 Mile Above Lake323132Map2010Details
Lake Onalaska - Brice Prairie Channel Dnr Access323134Map1999Details
Lake Onalaska - E of Rosebud Island10039979Map1988Details
Lake Onalaska - Lake Onalaska Off Brice Praire Channel323140Map2005Details
Lake Onalaska - N End of Rosebud Island10039974Map1988Details
Lake Onalaska - Near Halfway Creek10039977Map1988Details
Lake Onalaska - Near Mosey Landing10039978Map1988Details
Lake Onalaska - S of Halfway Creek10039975Map1988Details
Lake Onalaska - Site 1323098Map1997Details
Lake Onalaska - Site 2323099Map1997Details
Lake Onalaska - Site 3323100Map1997Details
Lake Onalaska - Site 4323101Map1997Details
Lake Onalaska - Steps 200 Yards10039976Map1988Details