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a lake.
Contact information
For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
Division of Water
Bureau of Water Quality
DNR Contacts for Lake Du Bay

Dubay Property Owners Association [exit DNR]

Find A Lake > Portage County > Lake Du Bay

Lake Du Bay
Portage, Marathon County, 4649 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 66 (Eutrophic) and was determined using Secchi data. For a Reservoir lake, this is considered Fair.

Lake Du Bay has been monitored by volunteers since 1993. 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 DuBay - N Marietta Ln10051991Map2021Details
Lake Dubay - Basin Above County DB503200Map2009Details
Lake Dubay - Basin Above Hwy 34503201Map2008Details
Lake Dubay - Deep Area Across From Little Eau Pleine River Inle503164Map2003Details
Lake Dubay - Deep Area Upstream Sth 34 Off Seagull Landing373445Map2015Details
Lake Dubay - Deep Hole - Upstream Dam503163Map2015Details
Lake Dubay - Little Eau Claire Basin503203Map2010Details
Lake Dubay - Mouth Of Little Eau Claire Bay503204Map2009Details
Lake Dubay - T26n R7e S20119Map1976Details
Wisconsin River - 2/3 Mi Ab Cmsp And P Rr Bridge373294Map1977Details
Wisconsin River - Above Dubay Dam - Deep Hole503003Map2018Details
Wisconsin River - Dubay Dam503170Map2000Details
Wisconsin River - Near Knowlton Cemetery373295Map1977Details
Wisconsin River at South End Of Big Island373293Map1977Details