Little Green Lake

Little Green Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Wisconsin average. High phosphorus is the leading drag on the score — likely from upland agriculture, lawn runoff, or in-lake sediment release.

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 alongside the lake's other 5 documented species — a notable draw for Wisconsin anglers. A documented public access point at Little Green Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.