Upper Kimball Lake

On the LakeGrade scale Upper Kimball Lake grades a B, with clarity at 10.0 ft and 20 µg/L of phosphorus placing it above the Wisconsin 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.

Mesotrophic conditions dominate at Upper Kimball Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. Upper Kimball Lake is a shallow lake at 11 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. The lake is compact at 42 acres, with partial shoreline records and little volume to buffer nutrient inputs. Upper Kimball Lake sits at rank 30 of 47 in Washburn County, in the lower half of the local distribution.

No invasive species are currently listed at Upper Kimball Lake — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 3 documented species across the lake's records. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.