Long Lake

On the LakeGrade rubric Long Lake fails the cutoffs — a TSI of 68 and persistent algal pressure put it in the bottom tier. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

At a TSI of 68, Long Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 38 ft puts Long Lake in the middle of Wisconsin's depth distribution. The lake's 119 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. Within the 18 graded lakes of Manitowoc County, Long Lake sits at rank 18, near the bottom of the county list.

Eurasian watermilfoil is established at Long Lake, which can dampen recreational access and pressure the native plant community. 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.