Oconomowoc Lake 2

On the LakeGrade rubric, Oconomowoc Lake 2 pulls an A: clarity at 14.6 ft and 16 µg/L of phosphorus put it in the top bracket for 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 near 41 places Oconomowoc Lake 2 in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 60 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. Oconomowoc Lake 2 covers 818 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Waukesha County's 48 graded lakes, Oconomowoc Lake 2 ranks 31 — below the local median, though not at the bottom.

Zebra mussel presence at Oconomowoc Lake 2 means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The fishery includes walleye alongside the lake's other 5 documented species — a notable draw for Wisconsin anglers. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.