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Land & Water Conservation

Mason Lake
Mason Lake is located in the Town of New Haven, Adams County, WI, in the Town of Douglas, Marquette County, and in the Town of Lewiston, Columbia County, in the south central part of Wisconsin. The largest part of the impoundment lies in Adams County. This impoundment (man-made lake) has 855 surface acres, maximum depth of 9 feet, with a surface watershed covering 28 square miles. The Town of Douglas owns the dam forming Mason Lake. Mason Lake is a popular fishing lake in both summer and winter.

Attached to Mason Lake by a channel is Amey Pond. Amey Pond is operated as a waterfowl refuge by the Wisconsin Department of Natural Resources and Duck Unlimited jointly. In 2002, Mason Lake was placed on the federal impaired waterways list (commonly called the “303(d)” list). The reasons for this placement included highly-elevated phosphorus level, eutrophication, pH problems, NPS contamination and degraded habitat. The lake is managed by the Mason Lake District.


Aquatic Plant Report 2006
Aquatic Plant Report 2009
Aquatic Plant Report 2014
Critical Habitat Report
Lake Classification Report Long
Lake Classification Report Short
Depth Map
Endangered Resources Map
Historical Resources Map
Land Use Map
Soils Map
Watershed Map
Wetlands Map 

2002-200320042005-20062007-200820092010 ;2011-20132014 -20152016 - 2017