Annabelle Lake

Annabelle Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. 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 value of 38 puts Annabelle Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Annabelle Lake reaches 30 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 194 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Among the 202 graded lakes in Vilas County, Annabelle Lake ranks 46 — in the top quartile locally.

An invasive species record — Purple Loosestrife — has been logged at Annabelle Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Annabelle Lake, one of 5 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.