Columbia Lake

On the LakeGrade rubric, Columbia Lake pulls an A: clarity at 35.3 ft and 12 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.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake's 72 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. Columbia Lake is small — 84 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Columbia Lake ranks 13 of 27 in Waupaca County — solidly in the upper half of the local distribution.

Zebra mussel presence at Columbia Lake 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 7 documented species — a notable draw for Wisconsin anglers. A documented public access point at Columbia Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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.