Upper Sucker Lake

On the LakeGrade scale Upper Sucker Lake grades a B, with clarity at 10.8 ft and 17 µg/L of phosphorus placing it above the Minnesota median. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI near 46 places Upper Sucker Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 25 ft puts Upper Sucker Lake in the middle of Minnesota's depth distribution. At 113 acres, Upper Sucker Lake fits the Minnesota median for monitored lakes, with 4.2 miles of shoreline. Upper Sucker Lake sits at rank 89 of 133 in Cass County, in the lower half of the local distribution.

No invasive species are currently listed at Upper Sucker Lake — the lake remains off the Minnesota infested-waters roster. Bass fishing is part of the appeal: the species list runs to 12, anchored by largemouth and/or smallmouth bass. No formal public access is documented at Upper Sucker Lake — most use is by shoreline residents and their guests. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.