Sugar Lake

On the LakeGrade rubric, Sugar Lake pulls an A: clarity at 15.5 ft and 10 µg/L of phosphorus put it in the top bracket for Minnesota. 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 value of 37 puts Sugar Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. A maximum depth of 45 ft puts Sugar Lake in the middle of Minnesota's depth distribution. Sugar Lake covers 416 acres alongside 4.1 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 53 graded lakes in Aitkin County, Sugar Lake ranks 5 — in the top quartile locally.

Sugar Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery includes walleye alongside the lake's other 13 documented species — a notable draw for Minnesota anglers. A documented public access point at Sugar Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 8 observed ice-outs, centered near Apr 16. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.