Little Green Lake

Little Green Lake grades an F: every scored parameter (clarity and phosphorus) rates poorly, placing it among the most stressed lakes monitored in Wisconsin. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. A maximum depth of 28 ft puts Little Green Lake in the middle of Wisconsin's depth distribution. Little Green Lake covers 462 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Little Green Lake ranks 10 of 13 in Green Lake County — at the lower end of the locally monitored distribution.

Eurasian watermilfoil is established at Little Green Lake, which can dampen recreational access and pressure the native plant community. The fishery includes walleye among the lake's 5 documented species — a notable draw for Wisconsin anglers. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.